Externals feel cheap on the Crossman clone such as the rubber on the grips and pump. The screws strip so easily as well if you plan on taking it apart.
I did try the S&W re branded of some Chinese company M3 clone TM shotgun and the externals feel so nice but the screws strip so easily as well.
The UTG shotgun clone I wasn't a fan of the rubber on the grips and pump but I'm not sure if it's me but the weight feels more heavy. (I didn't get a chance to take it apart, since it's my friends shotty).