Boy that's a tough one. A lot of that depends quite a bit on your fave cal and your intended use.
I currently have a HW80SL and a HW50, both in .22 cal. The 80 is for small game hunting. It's powerful but heavy, and the cooking force doesn't exactly make for the best choice for an afternoon of plinking.
I'd have to say at this point the 50 is my fave all-around gun, weighs in at about 6.8 lbs, about the weight of your average 20 gauge shotgun, so it's an easy carry. Reasonable cocking effort, and I basically bought it for plinking, but with judicious pellet selection (NYS requires at least 600 fps to qualify as a legal airgun for small game hunting) could be pressed into service for some small game hunting and pest control.
I also have a HW30S due to arrive any day, also in .22 cal, purchased as a family fun gun for pure plinking pleasure. No greased lightning in .22 cal, but I bought it for the light weight, easy cocking, and the unforgettable sound of a .22 pellet connecting with a tin can.
Hope this helps.