The Battledome- Vegeta vs Itachi

[Lauli]

I don't understand how you guys argue, it's always something like this:
"Gaara controls sand, Crocodile is sand; thus he must be weaker."

I mean I know about both animes equally nothing, but I've never seen Gaara "kill" his own sand. How would that work?
Crocodile clearly the better one here.