I thought this would be relevant:
http://www.apa.org/pi/parent.html
That's an official study and what-not, I haven't even finished reading it. So who knows, it could side with either side! Let's find out!
This was a study done on just about all factors. Including their relation to peers, their chances of being gay, their gender-roles etc. etc.
" In summary, there is no evidence to suggest that lesbians and gay men are unfit to be parents or that psychosocial development among children of gay men or lesbians is compromised in any respect relative to that among offspring of heterosexual parents. Not a single study has found children of gay or lesbian parents to be disadvantaged in any significant respect relative to children of heterosexual parents. Indeed, the evidence to date suggests that home environments provided by gay and lesbian parents are as likely as those provided by heterosexual parents to support and enable children's psychosocial growth.
It should be acknowledged that research on lesbian and gay parents and their children is still very new and relatively scarce. Less is known about children of gay fathers than about children of lesbian mothers. Little is known about development of the offspring of gay or lesbian parents during adolescence or adulthood. Sources of heterogeneity have yet to be systematically investigated. Longitudinal studies that follow lesbian and gay families over time are badly needed. "