I realize this is an old post...
I can't comfortably wear all gloves - many years ago my metacarpal and my knuckles were broken so unless the gloves are ergonomically correct, I'll have anywhere from discomfort to pain. I've fallen off wearing both Alipinestars and Spidi. Both performed as advertised; neither were compromised. I wiped both off when I got back to the pits and I went back out.
I've raced in Alpinestars and Spidi and been happy with the protection and ergonomics. I've never spent any significant amount of time in any of the other gloves that you've mentioned, so I can't really comment. I have seen a lot of fast guys in those brands though and I suspect that they wouldn't be working with garbage.
