You're right: there are some huge differences there. Bruce has got more backstory angst (His parents are DEAD!!!11!), whereas Tony has more personal angst (the Goddamned Batman does not have suicidal breakdowns or drinking problems). And while they're both kind of unstable in some ways, Bruce's instability is of the obessessive paranoia kind, while Tony's more emotionally unstable. And Bruce is a hand-to-hand combat expert and detective, whereas Tony's a tech geek at heart. They occupy similar positions in their respective superhero "pantheons," though -- they're both the voice of pragmatism/pessimism on their respective teams, contrasted to Superman & Cap's idealism and they have similar "civilian" personas (wealthy, slightly debauched businessman and member of high society, except that Tony's never hidden his engineering genius, and Bruce tends to play dumb).
Bruce in comics seems to get somewhat more action than Bruce in the movies, I think. None of it before becoming Batman, admittedly -- Bruce's sleeping around, or at least his dating and flirting, is as far as I know all confined to his "Bruce Wayne" persona, which he developed after he came back to Gotham to become Batman. So I'll give you that Tony got an earlier start.
Honestly, Tony's libido is somewhat exaggerated, too, though. During most of Iron Man canon, he's been a serial monogamist rather than a real "playboy." Bruce in comics canon has a bunch of temporary and interchangeable women because, thanks to his mission as Batman always coming first, he can't afford to get involved with anyone permenantly and can only have "disposable" relationships. Tony, when he sleeps around with random people, does it because he thinks of himself as disposable -- but what he really wants is something permenant. Like the classic slutty girl in high school with low self esteem.
There have only been two periods of real "a different woman every night" stuff: in the early canon, when Tony still had to wear his metal breastplate all the time to keep his heart beating, and was trying to distract himslf with other woman because he knew he could never have Pepper Potts (first because he was dying of heart failure, then because she was in love with Happy Hogan). He regularly blew off dates to go play with tech stuff (there's running gag in several issues of Tales of Suspense where the same blonde gets stood up a couple times in a row, and never actually gets a date with him) and never actually had sex with any of them, because then they would have noticed that he was wearing a giant piece of metal under his shirt. Tony-is-a-ho period #2 was during the late 80s/early 90s, when the writing eventually got so bad that they later retconned him to have been under mind control (my fanwank is that Tony's late-80s promiscuity -- which is where both Ultimates!Tony and movie Tony's sex lives seem to come from -- was a combination of a desperate search for some form of affection/approval because he'd just come out of a serious bout with depression, and a substitution of a new self-destructive behavior in place of drinking).
BTW, Meredith has been retconned out -- Sunset Bain's replaced her as Tony's first girlfriend. I'm not sure is Joanna is still canon, either. There's been no specific retcon erasing her, but nobody's mentioned her since before the 1998 reboot.
Re: Bruce Wayne's libedo is probably greatly exagerated
Bruce in comics seems to get somewhat more action than Bruce in the movies, I think. None of it before becoming Batman, admittedly -- Bruce's sleeping around, or at least his dating and flirting, is as far as I know all confined to his "Bruce Wayne" persona, which he developed after he came back to Gotham to become Batman. So I'll give you that Tony got an earlier start.
Honestly, Tony's libido is somewhat exaggerated, too, though. During most of Iron Man canon, he's been a serial monogamist rather than a real "playboy." Bruce in comics canon has a bunch of temporary and interchangeable women because, thanks to his mission as Batman always coming first, he can't afford to get involved with anyone permenantly and can only have "disposable" relationships. Tony, when he sleeps around with random people, does it because he thinks of himself as disposable -- but what he really wants is something permenant. Like the classic slutty girl in high school with low self esteem.
There have only been two periods of real "a different woman every night" stuff: in the early canon, when Tony still had to wear his metal breastplate all the time to keep his heart beating, and was trying to distract himslf with other woman because he knew he could never have Pepper Potts (first because he was dying of heart failure, then because she was in love with Happy Hogan). He regularly blew off dates to go play with tech stuff (there's running gag in several issues of Tales of Suspense where the same blonde gets stood up a couple times in a row, and never actually gets a date with him) and never actually had sex with any of them, because then they would have noticed that he was wearing a giant piece of metal under his shirt. Tony-is-a-ho period #2 was during the late 80s/early 90s, when the writing eventually got so bad that they later retconned him to have been under mind control (my fanwank is that Tony's late-80s promiscuity -- which is where both Ultimates!Tony and movie Tony's sex lives seem to come from -- was a combination of a desperate search for some form of affection/approval because he'd just come out of a serious bout with depression, and a substitution of a new self-destructive behavior in place of drinking).
BTW, Meredith has been retconned out -- Sunset Bain's replaced her as Tony's first girlfriend. I'm not sure is Joanna is still canon, either. There's been no specific retcon erasing her, but nobody's mentioned her since before the 1998 reboot.