Here is a video talking about how the Russian cheat in Marine Troopers (I think it is last year) by cancelling the race on water because they know that their BTR's 9km/h swimming is nowhere near the 40km/h of the ZBD. However, it also mention the weakness of the ZBD is its low speed on ground and small diameter road-wheels, and the export to Venezuela as VN16 and VN18 and how the customer think about them.
To me, the BTR and ZBD are two different types of vehicles and can't be directly be compared with each others. Why China doesn't bring their ZBL-09?