Of course Boundman is better defensively. Snakeman is skinny. Boundman is like Fuusen.
As I said, the only reason Luffy would ever use Tankman or Snakeman is at a
matchup disadvantage. Snakeman sacrifices defence, while Tankman completely sacrifices his mobiliy.
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Mate, Cracker
instigated this attack. Luffy counterattacked and Cracker got bodied.
Oh my god...
This was base Luffy vs. Katakuri at the end of it
This was base Luffy vs. Cracker
Cracker wore out Luffy's stamina (or Luffy wore out his stamina). His HP damage was minimal. Katakuri actually did damage (HP).
As I said, you have no argument here.
Oda decided Tankman -> Cracker, Snakeman -> Katakuri. That means Boundman wasn't suited for them. But Boundman is his main form, and most well rounded form in terms of speed, power and defence.