Most Helpful Guy
Rum is far more popular, and for good reason.
Most people are just looking for something palatable that will get them drunk, and that they can keep drinking for 7-8 hours solid, without spending too much money in the process. Rum & coke fits the bill perfectly, unlike anything gin-based (G&T is also seen as an old person's drink).
Personally, I prefer White Russians (with added Baileys), but they're a bit dangerous - they go down waaay too easily for the amount of alcohol in them.1