I am bi with a strong preference toward men, so I usually just say I'm gay, just like I used to just say I was straight before transitioning. I can look at women, think about it, and feel very strong sexual attraction, but with men it is more spontaneous, and when I have wet dreams they are always about men. Strangely enough, I have always been a man myself in these dreams (as well as in my fantasies) which was one of the things that helped me figure out that I was trans since I was not all that butch of a person when it came to the ways I dressed or the hobbies I chose (though my attitude was always VERY masculine, hence people constantly assuming I was a lesbian then getting super confused when they saw me flirting with men).
I have no clue what the numbers on gay trans men are, but I have met quite a few gay and bi trans men and women, so it wouldn't surprise me if the rate is higher than the rate for cis people. If there are more gay trans people than cis people, and if I *had* to guess why (a lot "ifs" there), I would say it's probably because there are more straight than gay people and, therefore, a gay trans man (who started life as a straight female) is more statistically probable than a straight trans man (who started life as a gay female) in the technical sense. Please excuse the lack of sensitive terminology and such there--I'm just trying to get a guess across, with the acknowledgement that it is 100% an idle guess and there is simply not enough scientific data on the subject to do anything other than make guesses based on assumptions.
Overall, though, I am SO much happier as a gay man than I was presenting as a straight woman. Sure, there are plenty of gay guys out there who will spurn me for my lack of junk, but I just smile serenely and inform them that I understand--not everyone can handle the intense experience of bottoming to a guy who has vibrating nether parts the size of a horse.

Plus, I have met some pretty open minded gay men, too. And it helps that I was a part of the BDSM community for many years and, therefore, don't have the worries some people do about people only wanting to be with me because they fetishize trans people. That sort of thing doesn't bother me in the least, because I have no problem with fetishes and kinks, so I don't have to spend time questioning whether a gay guy likes me as a man or likes me because I'm trans--I don't care as long as we are both getting enjoyment out of the experience.