LTM upgrade to v11 from v10

any recommendations between clean install or convert within v10 first?

if you do not want 10.x anymore, i think clean installation is good to go.

sol15459: BIG-IP systems that use partition disk style cannot be upgraded to versions 11.0.0 or later

http://support.f5.com/kb/en-us/solutions/public/15000/400/sol15459.html