So how are the top guilds viewed? Like, how are they up there? By members? Guild level?

Its filtered by the most members first but that filter can be edited for searching.

Oh, so a level 1 guild with most member would show on top even if there's a level 3 guild with less members? Okay. (:

I tend to look at the praise number personally. Just because a guild has 300 members doesn't mean its a good, friendly or active guild (although I guess that could apply to the praise number to). But a higher praise at least indicates that its own members are being active in order to be praising daily to keep that number higher, and some of the praise could have come from 'outsiders' who have been impressed by the behavior of the guild members.