CROSMAN C11 Tactical or C21 or C31?

Hey guys I'm looking into buying one of these guns but I have heard mixed things about them such as the c11 tactical not shooting as fast as it says (550 fps) but it looks cool with the laser and mock silencer and the c21 nothing really bad just is a bit slower at (495 fps) as well as the c31 but what I love about these two is the fiber optics sights the c11 tactical is about $56 and the c21 is $56 as well and the c31 with holster is $45 I just wanted to ask if anyone with knowledge about these guns could tell me which one is best thanks