Between myself, my dad and brothers we have a Benjamin marauder in .22, a RWS Diana Panther 34 in .22, and THe Benjamin Sheridan pump up rifles in .177, two .20 cal, and one .22.
The Marauder is the most accurate of the group by a huge margin. It is the quickest to reload, the quietest, but the most expensive. Also i think the .22 will do 1000 fps. So very powerful. It also has a dovetailed reciever. It is the heaviest of the group, and kinda ugly if you ask me.
The RWS panther is the best looking rifle of the group, fairly quick for reloads, is rated for 1000 fps. But unfortunately it is the least accurate by a huge margin. we have attributed the poor accuracy to the operator having to manipulate the barrel to break open the action then close the action possibly not returning the barrel exactly to where the rifle is zeroed for. And then the spring action vibrates the gun so bad that it actually moves the rear sight around after shooting for a little while. Blue loctite on the screws helped but the rifle still will simply not hold zero. I haven't yet seen anybody shoot that rifle with any really accuracy. I have seen dozens of missed starlings and very few hits. Maybe we got a lemon.
THe Benjamin Sheridan pump up guns are good. THey are the least expensive of the group. Plenty of killing power for pests. I haven't noticed much difference in killing power between the .117, .20, or .22. I think its a bullet weight/velocity trade-off. Accuracy is good for an iron sight gun. Cons are that they are the slowest to reload, lower velocities than the other two guns and no scope mount.
I would recommend the Marauder with a scope and the scuba tank and adapter if you can spend the extra money for it. If you dont want to spend that kind of money on an air rifle the Benjamin Sheridan pump up rifles are good. There are some great youtube videos about the marauder. It really is extremely accurate. I wouldn't recommend the RWS panther 34 to anyone. Even to somebody I don't like.