i like both the pc version and the n64 differently
the n64 with the dual smgs, and heat seaking missile which wins, a single player and dukematch map based on a map from the atomic expansion for the PC
the PC for the freezer and devastator, the four expanions, dule it out in DC, nuclear winter, lifes a beach and atomic also all the costom maps you can download like the roch series which are the best maps ever
they are the best FPSs ive ever played (apart from goldeneye, perfect dark and the timesplitters series) but ive had more time on the N64 version than the PC one