1) still plate armor
2) i'd probably say crosses, you can take the extra defense, you dont attack anyway
3) Apocalypse was good for both FS and B Saders iirc. Apocalypse gives a good buff, and also does damage, so its up to you if you want it.
Also, not sure if it works anymore but you can stack apocalypse by using it, leave room before lasers, come back after CD ends, repeat until desired number of disco laser balls are present, let all of them activate, and then gg. was mainly used to destroy hell parties if you wanted to do it like that, although it did take a while.