Have you looked at pics of each brand LCA? They are both functional. One is "aftermarket" looking (nice!) and the other is OEM (stock) looking.
IIRC, the SPL has more adjustment then the SPC.
Yes, LCA are needed to dial in rear camber after lowering. I would suggest a bump steer kit too. like this...
http://www.ft86club.com/forums/showthread.php?t=130715
If the coils you are getting have tophats with camber adjustment in the front; cool. If not, you will want camber bolts at a minimum, possibly camber plates.
Pro Tip: Use google to search. Type in what you are looking for and then add "ft86club". It makes finding things easier.