You can pretty much run the gambit on bases. Picatinny rails will vary with the maker, some are aluminum and others are steel, some have zero cant while others can have 10,15,20,30 or 40 moa cant, some will use 8-40 screws while some use the standard 6-48. Personally I run Farrel, Near MFG, Nightforce, Badger and Seekins. .They all offer adjustability and ruggedness.
You will need to decide what is best for you and what you are planning to do with your rifle. I have some base/ring combinations where weight isnt a issue and they add over a pound in weight while others rifles I am counting ounces and want the lightest possible to stay in weight class.