If "best platform" also includes forum software, then something like SMF or phpBB would be nice.
A working converter exist for YaBB2.2 --> SMF
If the search function (hint hint) worked any better (more than just 25 results...), I could give you some posts where this was discussed before.
A quote button and a more 'obvious' link to the 'user menu' would be nice too.
Agreed! SMF FTW!