I wonder why there are so few options, where is for example 3vs3 TB etc.? ;O Honestly, I think you shouldn't change the system, you change your mind too often, it looks like the levelmaking contest was just useless (or not, because we got many good levels ).
For example, I'm sure it will be really hard (or impossible? ;P) to get at least 9 people at the same time to play a match.

However, as I prefer teamgames, I vote for TB ;;
And I think that it shouldn't be called 'clan tournament', becasue you again won't get enough real active clans, people should be allowed to form their own teams with whoever they want to (so, for example Cracco Clan* can make 2 teams, and there is no need for 'LB' ).

*yeah, I love this 'cc' bug.