I have had an rws 48 since the late 80's. The side cock takes some getting used to and you will have to bend the rod back straight more than once.
They have a lot of power, the 48 is a .177, but with heavy pellets will shoot good. Light pellets will shotgun pattern in my gun and are loud.
The break barrel guns seem to be better balanced, my 48 sits unused while the benjamin np trail gets used a lot. The break barrel is just easier to shoot.
The rws guns are far better made and will last and function for decades. I am betting the .22 cal will be more accurate than the .177. Not sure what else is the difference between 48 and 54 models except cal. and stock. The stock may make up for the barrel heavy "club" feel of the older 48's which would make them easier to shoot well.
Good luck on your choice.
