I preferred my bk to my current hk. It softer and more comfortable but the plastic teeth started to fall off the velcro so it kept 'bursting' open while playing. It was a v1 so this might be sorted by now. Being completely honest I did put it through the wash (like I have done with my packs for the last 15 years) so that might have been the problem
I've had no issues with my Bunkerkings pack (V1). It's worked nearly flawlessly every time. Personally, it's down to colours for me. The HK adjustment system is nothing but a pain the the ass that isn't really needed, as the BK pack proves.