It can be handy to have a set of gears handy, if the slipper is fully locked up they can fail under extreme stress (like holding the throttle wide open during an accident causing suddent jolts to the drive train, but you wouldn't do that would you
). Under normal use with a properly adjusted slipper they last forever.
The two one way options do different things, the centre one way is easier to drive in general than the one way diff but normally slower unless the track is bumpy.
The one way diff gives medium initial turn-in, medium mid corner steering and the most on power exit steering.
The centre one way gives medium initial steering, the most mid corner and medium on power steering.
Full time 4wd gives the least entry and mid corner steering, and medium on power steering.
Indoors I always use the one way diff, outdoors I go to the centre one way on dirt or if the track cuts up badly.