NL20 speed AK from UTG.

If villain opens wide from utg, and calls a lot 3bets or opens wide and 4bet bluffs a lot I think 3betting is the best. Without info it's a call pre.

We can't shove for value as default but we can call the 4bet if we think that he is bluffing even some of the time because AK dominates his bluffs.

Preflop: General rule of thumb vs unknown is that you shouldn't 3bet something for value with the intention of folding it to a 4bet. Unless you have a very strong read that he's never 4-bet bluffing but always calling the 3b with many worse hands.

I think calling here is fine if you don't feel like you can jam it in profitably. I would flat the 4bet here cos I think shoving might be overplay. This allows you to keep in some of his bluffs, though I think he might have not too many bluffs given starting positions.

But if you end up playing too weak postflop then jamming might be preferred.