Depends on the application. I have a CO-51S with padded nylon for my cell phone, but a CO-30 with tactical nylon for my G2Z.
Generally, it seems the tactical nylon Ripoffs are more compact. I also have a CO-63 for the 6P, and it's bulkier than the CO-30.
I recently ordered a CO-124 (originally designed for the Inova X5) for my L4, and unfortunately, it only comes in the padded cloth. I'll get it Monday, so I'll find out if it's bulky or not.