I'd have to give an edge to Team Kobe's bigs, but on the flip side Playoff Rondo is nearly unstoppable.
Even though AB would have a slight disadvantage height-wise vs Kobe, I think AB's athleticism would help to alleviate this - some.
At least until Kobe starts taking Rondo or AB into the post.
Dalembert is one big I had my eyes on. Presumably, in this format he's kept Duncan fresh during the regular season, allowing him to play very well and extended minutes during the playoffs.
A rested Tim Duncan is a top big in the playoffs.
Fun matchup.