Could you explain why you think the KeepKey is the most secure of the hardware wallets? What does it offer additionaly in terms of security compared to the other solutions? I was looking it up on their site, but couldn't find anything that the others don't have.
I havent tried out that Keepkey since i do only have idea and experience on Trezor but knowing it only stores up few altcoin as far as i remember maybe only 5 coins but they do have plans on doing an extent on other coins. If you do have 20 different coins then i would bet you cant find any hardware wallet would have this storing capability.