There's a ton of info on here on them.
Osterine is great for a small bulk, PCT, and most notably recomp. You can expect ~5-6lbs of lean mass from an 8 week cycle and you'll only need a precautionary mini PCT.
S-4 is great for cutting! You'll need a mini PCT for it as well.
LGD is fairly new. Looks to be very promising for a bulker. Clinicals show 1lb of muscle gain a week in clinicals at a low dose. It's suppressive, so a full PCT is required.