For my own have tested few LSD, KAAZ,OS Giken,Cusco, Carbonetic(ATS&Across),Spoon,Mugen,Rigid,JS racing, choosing LSD its depend which you going to use and understand what your car need. 1 or 1.5 way will suite for most our FF car
my self will suggest 1.5 way if give some engine braking on down shift even you use it on road racing or circuit racing if for drag racing ,1 way will the best if will not slow your up shift time
different brand have different design such like clutch type, metal type or helical, most of helical type was 1 way and close for OEM and able handle higher torque
For clutch type its can rebuilt and a bit higher maintenance after the clutch worn but its could last up to 50k miles depend how you use it and its more suitable for DD, road racing , endurance race
Metal type will have lots klac" klac" sound where most ppl don't like it and its good for drag racing,time attack cause its could handle higher wheel torque but its generate lots of heat to gear oil
its just me 2 cents and my poor english hope you guys don't mind