If I had to chose to see only one of these, which one should i see? Star Trek or Terminator Salvation?

I have seen both and i thought they were both pretty good. Any one you see you should not be dissapointed but if i had to chose one it would be the terminator one simply because i am not a huge fan of the prequel or a movie that tells a begining i like movies that take place after other movies. I like to see how it is going to end instead of what h appened in the begining.