It depends on what you are going to do with the cylinder, if you are going to put full pressure and load on it both in and out you will want a cyl with screw in gland or gland nut threaded on the o.d. of the tube. Not a snap ring or tie rod cyl. On a grapple bucket it would not have much load when retracting so it would not have to be as heavy duty I think. Cheap cylinders are built cheap, I bought a snap ring one from Northern tool for my wood splitter and had tough wood so I cranked up the relief valve on the tractor and blew the seal on the piston. It only had a o ring and a backup for a seal. replaced the seal , stopped abusing it and it works o.k. but a good cyl would have had a better piston seal. Take a look at some commercially made grapples and use what ever they use.
