After going over Jim Wendler's Bench press index video, I've noticed he talks about 2 slightly different benching styles: Metal Militia and West Side Barbell. The set up looks very simialr but the execution is different.

Correct me if I'm wrong but the west side style is a straight up and down press and the metal militia has a bit of an arch throught the ROM.

What style do you guys use and is there an advantage of using one over the other? I use a West side style but find that when I set the bar at the top of the press I am not always lined up to go down straight which throws the press off. I train alone most of the time and do not have someone to give me a hand off.

Any thoughts would be greatly appreciated.