I avoid any hot sauce that has capsaicin listed as an ingredient - I'm after the flavour and heat of the peppers used to make the sauce, not a synthesized chemical added to simply create a burning sensation. I consider it gimmicky to boast you have a super hot product, when you essentially dumped pepper spray into a bottle, rather than cultivate or select intense, flavourful peppers for your sauce.
For anyone interested in growing their own hot peppers to make their own sauces, a great source of seeds is here:
http://pepperjoe.com/
I've used some of his seeds before and they produce great peppers. They throw in some bonus seed packets in each order, so you always have something unusual to try out too.