will s5 LSD fit my S4 Se if so is there a specific model that has a better lsd(s4 GXL, S5 GXL S4 TII, S5 TII...ETC)

 

S5 fits in S4, TII uses a larger differential so the LSD from TII won't fit in the NA housing. If you're going to use TII you'll need the complete rear assembly including halfshafts and drive shaft. Most people on this site prefer the S5 LSD. S4 LSD uses clutch plates and most are worn out and not up to high performance applications.