Depends on the fit. A team with LeBron but without D-Wade and a solid cast of defensive players...Amar'e. LeBron and a solid interior center (honestly, Robin Lopez comes to mind..or a healthy JO, or Serge Ibaka..just has to be mobile, jumpshot optional..Dalembert would work too) would go a long way towards finding a balance between offense and defense.
A team with D-Wade and LeBron, Bosh. For the reasons faf listed.