Not to get all "back in myyyy day", and at the nearly guaranteed risk of getting flamed by Apple-haters, but man webcams are fugly now. The build quality and look of Apple's original external iSight from what? 2003? Nothing modern comes close.
Logitech dominates the webcam market, but their drivers are total CR@P and their "support" consists of "that feature is no longer supported". Their business model seems all about putting a camera on the market, then killing some or all of the functionality with a driver update, shrugging their shoulders and suggesting a newer model.
Obsolescence via software updates is not a model I find very attractive.
Personally I've had two of the C920 just stop working on me and it was during moves, they were packed very carefully as well. I'm on my third, maybe I'll try their c922x but meh.
If you arent doing streaming then dont get em. If you are then get em. I perfer the logitech brio even though the razer is smaller and compact. I have seen some people use actual go pros as webcams which is nice