Hobs has the highest attack of any jug pet.
He's a poor tank.
You really don't need that high attack for dynamis however. The attack bonus shines mostly when fighting higher def, or higher level mobs. Dynamis they are all many levels lower. Our pets already have high attack in general. It takes alot of attack+ to make a significant difference when pet already has significantly higher attack than mob's def.
Gooey is a great tank, but has low attack. If you put corrosive ooze on a mob, gooey will do about the same damage as Hobs, but everyone else will be doing more damage also. Gooey would be better for crowds than Hobs is.
Lulush is my favorite default pet. Lulush is the most flexible between big party cures, a paralyze enfeeble and 2 very handy physical Ready moves for single target or AoE.
Yuly eva tanks better than Falcorr. Falcorr's dd is better.
Broncha has Dispelga and high int so tanks magic better than most jugs except Gooey, or specific elemental resistances.
In Abyssea, Falcorr has the highest DD potential for any jug pet because of the Crit damage + and how fantod works.