I'd opt for the maroon lot and tailgating.
Getting to Reliant on the Metro Rail is relatively painless - getting out is another story altogether. I gave my Blue Parking Pass to some friends two years ago for one game and rode the Metro Rail.
Going back to my truck was something like NY Subway hell. It was hot...really hot. There were hundreds of sweaty people pushing to get on the little cars. Once on, there were people standing, sitting, leaning - it was pretty much a once in a lifetime experience for sure. I've never done it again nor have I ever recommended it.
If you decide to go with the Metro Rail, park as close as possible so you don't have to ride it very far. That was my second mistake - I parked in the $2 lot downtown - that is a very, very long way on a hot day with 4000 fans around you in one small rail car while stopping every other block.