If I were buying a Crosman air rifle, and the choice was limited to the two you are asking about, I would get the Storm XT.
It comes with a more powerful -- and adjustable -- scope, and the trigger is not only a two-stage (usually means it releases the safety with a slight pull), it is adjustable for pull weight as well. It also has a "scope stop", which helps prevent the scope moving when you shoot the rifle.
Both rifles are spring-powered "break barrel" rifles, meaning the barrel itself is the cocking mechanism and therefor single-shot only, and both are rated for the same FPS. They are both the same weight, the same length, the same everything -- except for the scope, the "scope stop" and the trigger.
There is nothing "wrong" with Crosman airguns, they are at least accurate -- and you won't have to shell out $300 or more for one.