Peychaud is probably the second biggest brand. Since I drink this at bars, it really depends on what they have on hand. Most good bars will have a selection of 5-10+ different bitters. I like grapefruit bitters; I've also had really good spicy chili bitters. Many like orange bitters. Just ask the bartender for recs, they usually love chatting about this stuff.

The best part of this drink is that they rarely charge me anything for it. I'll usually tip a couple bucks per drink, and everybody ends up happy!