Very much this! You can see which guilds are up to date by the most recent posts and updates to their guildpage. In combination with using the wow-armory you’ll also be able to see how many characters each guild has in-game as well, do take in account that people do add their alts in a guild. (personally I always assume on average each member has one alt in a guild, but this isn’t a clear-cut thing)
And if I can shill my own guild, we’re currently in our up-and-coming stage as few new folks have joined our small core squad while we get to know eachother IC and OOC. We do collab with other guilds often, if that may not be your thing.
Hope you find your guild to call home! 