I have both Star Trek Attack Wing and Star Wars X-Wing Miniatures. The rules are almost the same, but there are some shades of difference and I prefer the Star Trek Attack Wing rules. However, I almost never play it. I much rather play X-Wing Miniatures (and I own every miniatures that they've released, including the newer capital ships). The Star Trek Attack Wing miniatures are not of good quality, their paint jobs are terrible, and their scaling is inconsistent. However, they are hardy (you can drop them and they won't break, unlike the Star Wars X-Wing Miniatures).
So I generally play Star Trek Attack Wing with my kids (because they can't break them), but play Star Wars X-Wing Miniatures with my friends.