Vote Up Down Module vs. Flags

I've tried both too. Flag is more widely used overall, and much more flexible and well integrated with views, rules and so on. On the other hand, if you're using a system strictly for a binary decision on the part of the user, such as thumbs up/down, Vote up/down may be the way to go if you want it to work out of the box. For example, on my project Pubzy.com I use flag for people to weigh in on whether or not they believe or don't believe a given claim or legend, but I can't show what percentage of people believe or disbelieve a given claim without some custom work, and I think I would get that out of the box with Vote up/down, although it's been a while, I'll have to check on that too. Best of luck.

The most important thing to keep in mind in this comparison is that Flag is not Vote Up/Down solution. It is a "Vote Up" solution, with no "Down". Flag is not really a binary system so much as a TRUE or Unknown solution. A user can say if they like something, but not if they do not like something (unless you make 2 flags, but then these are independent of each other and not really good for sorting).

Thanks, makes sense, in my case I'll have to decide whether the advantages of Flag (and there are lots) outweigh the advantages of sorting by percentages and so on.

I'd like to rephrase what quicksketch said:
Flag is a binary system with 2 states: vote yes, no vote.
VoteUp/Down is a ternary system with 3 states: votes yes, vote no, no vote.

I'd like to propose that while crea may be offering a lot more detail into why flags and vote up/down are different, the info might make this way more confusing for a newbie. What quicksketch said makes way more sense to me.