Depends on what is considered stock bracing, and what is "aftermarket"! You can build a stiff chassis, and not use anymore tube, than you would for a "soft" chassis. Bracing is a matter of placement and angle's. Myself, I prefer a stiff, or rigid chassis, there is nothing more frustrating than having something that is an unknown, effecting your adjustability of the chassis, and the changes you make, it is the job/function of the suspension to make this possible, if the chassis is too flexible, or so flexible that to make a noticable adjustment, you have to reposition an arm, or stop, or bar or coil, you only get good at changing these parts, if, on the otherhand, the chassis is stiff, or rigid, you can make small, 1/8th turns on the stops, or coils, and tell a difference, then you don't have to disassemble the chassis, to get it done. JMHO, but I'd vote for the rigid chassis. Bob