Anakin Skywalker (AotC) vs Ben Kenobi (ANH)

Standard conditions.

Bonus round: Ben and Anakin fight, Ben is fighting under the assumption that Anakin is trying to steal Luke. Fight takes place outside the Lars home.

Anakin stomps.

Ben is inferior to ESB Luke, somebody with less training and inferior potential to Anakin. The poor guy is also buried far beneath TPM Kenobi per Lucas. Don't think it takes a genius to work out who takes this one.

Ben wrecks

Ben probably wins.

I’ll back Anakin

Ben wins

Standard: 

There's a chance that the stupidity of this version of Anakin makes him rush in and overextend himself but I think it's more likely if he's fighting someone who hasn't just caused the deaths of almost two hundred Jedi and ordered the attempted assassination of his crush soon to be wife that he'd be more careful. I'd say Anakin wins with some difficulty. 

Bonus round: 

I don't see even AOTC Anakin overextending blade to blade the way Maul did or leaving any openings. The reason he went down against Dooku is because he was constantly ramping up his offensive output in speed mostly to keep up with Dooku. I don't think he'd have to do the same or at least not to the same level with Ben Kenobi. Honestly I could see Anakin winning once Kenobi starts getting tired before Anakin does.

Anakin walks right through him.

The notion of Anakin stomping is quite ridiculous, considering that not only is he a padawan but there is no reason he would perform above base level against Kenobi.

Base Anakin tires Ben faster than tentative Vader. If he feels like it he can amp/focus himself at will like he did numerous times in the JQ series.

ben stomps

Ben fighting for Luke is the one that's interesting here and in that way Anakin dies

How does Ben not wreck here?  Held his own against Vader, killed Maul, and isn't he confirmed to be better than his ROTS self?  Or at least on par?

Legends only.

I thought even in Legends ROTS Kenobi > ANH Kenobi was a thing.