PrimeDice is listed highest on the "
Weekly top 10" and they are normally listed #1 in the "main list". Unfortunately their stats got reset (on their side) so that's why they are listed much lower right now. I might fix it on my side, but I was hoping they would fix it on their side
But yes, I do believe PD is the most popular bitcoin gambling site. I am guessing mostly because they have been around for a pretty long while, got a good/trusted reputation (don't remember any real issues), have a site that works good, been pretty good to the community w give-aways, etc.
PS, most non-dice sites (casinos) are not very transparent and don't always have "public bet lists" or statistics. Also for example "casino FortuneJack" has faked their statistics before (they adjusted it after I showed proof of that.) Dice sites are generally more transparent, so that's why I only list them atm. There are other games that are equally transparent though, for example (also 1 of most popular bitcoin gambling site) bustabit.
edit: ah misread about "pocketdice". But I don't list "pocketdice" because their provably fair implementation is flawed and they didn't fix it yet almost a year after "keepinquiet" reported that to them:
https://bitcointalk.org/index.php?topic=1077905.0 I do not really think they really cheat, but it should be easy enough to fix that.