The magpul is ok, my biggest complaint about them is there’s only two MLOK slots on the very front bottom of the forend for a bipod, it would be better if it went all the way back to attach and ARCA plate for tripod mounting. The cheek piece system is also a little janky and doesn’t allow fine tuning to get a great cheek weld. The grip angle also isn’t as ideal for precision shooting, but it’s not bad.
KRG Bravos are excellent. Not too heavy, full MLOK on the bottom, adjustable check piece, and lots of accessory options too.
I haven’t been a fan of MDT since I tried their LSS and TAC21 chassis years ago, those things were pure trash. Some of their comp chassis are ok but I still wouldn’t buy one because the QC just isn’t there.