I have used, head cams barrels cams and lots of them....( check out videos on youtube with the same username ie gambo47...)
Without a doubt the best two were the back eye cams and the contour for robustness and image quailty. The only problem is that I reckon 100% are produced for a mass market ie not just paintball and most have therefore fitted a wide angle lens for use to capture scenic video of bikers, rock climbers etc etc Now there lies the problem..they are not robust enough on their own to withstand direct hits, they are "stick out targets" and increase a risk of hits, trees and bunkers are "fisheyed" and most action is at a distance too far away to be recorded for posterity. What you need is either a barrel cam that records good sound, can withstand hits and has a 70degree or less lens not 120, 180 etc either spend a lot and get something really good or buy real cheap and be prepared to replace it when it has been hit. OR a headcam that you wear in the centre of your goggles.
I really have lost count on the brands, types, of cams I have tried ( barrel cams aren't as good as head cams as they don't capture the sound well and film lots of ground,, sky and barricades etc headcams are easiest in my opinion and the black eye cam took the best footage overall as the lens was not as wide as the contour. ( PS contour DO not accept the warranty for direct paintball hits..no matter what you think you see or read on their site) I adapted the underwater cover for my contour for paintballing.
good luck