A very good question. I only had my first D&S a few years ago, made with Havana Club. I hadn't been a fan of rum drinks, but this was different. I have since had them made with watery ginger beer stuff, with over-produced "artisanal" cordials that tasted like an incinerated gingerbread house; and with Gosling's own super sweet canned ginger beer. I have to agree with Nathan. Reed's extra ginger is the driest, and therefore best in my opinion for a good Dark & Stormy. With Gosling's, of course, if one can't secure any Havana Club.