At the end of the day, for me, it is all about that particular girl. If she's a t-girl or if she's a GG I'd want to get to know her and take it from there.
Physical attraction is what usually attracts most people to anyone initially. It might seem shallow but it is a fact of life. It is for me anyway. If I find a girl attractive initially I'll endeavour to find out more and more about her by getting to know her. That's how I operate. I think it is the way it should be done. If after a period of time this leads to you loving the girl in question then that is clearly a wonderful thing.
If I had the opportunity for it to happen, I would love it to and that applies to a TG or a GG.
I also don't believe there is any ignominy in wanting to be with a TG because she is a TG. If it is the ONLY reason then it may be the case that it is not a solid foundation to build a relationship upon. But on the other hand, liking a TG because she is a TG is similar to having a preference of blonde or brunette hair or a certain build etc. If it's a preference as oppose to the "be all and end all" then I believe it's fine.
At the end of the day, I'm of the opinion that, you'd have to be pretty damn stupid not to prefer TGs but that's just me