I've seen bitcoingarden and their UI is just like a copy paste from here and seems it's a dead forum with have few useful topics.
You can't say that's copy, all forums built on SMF looks more or less similar. You simply can't make forum which would look 100% unique when SMF is used on thousands of forums.
I searched top 10 crypto currency forums and they are the ones that came up in the searches
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So, you just Googled top 10 crypto forums and just copied search results without even checking it. Much work done!
Guys, there are no need to compare these forums with Bitcointalk. Simply it can't be compared by history, number of members, content and etc. But some of these forums can be partial alternative to Bitcointalk, some are for people who interested in specific altcoin. There is also some good non-English crypto forums like Bitalk.org