Mate, I'll connect with you through experience. When I first joined POF, I asked the same question. "Can I join which ever guild is the strongest." I've learned over time that levels, and member count for that matter, are only numbers. You may find a guild like that, only to realize, well, maybe its not as great as you would have expected. Still, its what you want. Just remember, the most important muscle is the heart
Good luck mate!