Keep in mind while hunting for a guild, no one guild is "better" than another, despite what one guild or person tries to tell you. Each guild is unique and diverse in their own spectrum, so it's almost impossible to compare two guilds equally.
In the end, it comes down to what you want out of a guild. If you see one that you think might fit your interests, ask the Guildmaster if you can slip your pirate in there for a "trial period," to test it out. Don't be afraid to extend your horizons, either - you might want to try going out for a type of guild you've never been in, to see what it's like.
And, of course, don't stay minded on only guilds that have threads/subforums here. We have a mighty collection of guilds in these forums, but the ones we have here are only representatives in a sea of thousands of guilds. Try asking people in your friends list what guilds they like. Sampling from many plates gives you a better idea of what you prefer, and from there, you can make a really defined judgement
P.S. It's also a great idea to post what kind of guild you're looking for, when you're ready. That will also allow us to make a few suggestions more clearly, but, again, in the end, it's whether you enjoy said guild(s) or not.