So Which Of These Three Actors Portrayed Batman Best?

Keaton, by far.

I liked all three, but personally I would rank them as:

1. Bale
2. Keaton
3. Pattinson

Keaton
Affleck - (I'm not even a fan but I liked his Batman. Should've got a solo film)
Bale - (But only in Begins. He was ridiculous in the sequels)
Pattinson

Keaton
Bale
Pattinson
Pattinson's Bruce Wayne was too depressed 100% of the time and his movie should have ended with Riddler getting arrested. The finale felt really tacked on.

Batman,
1. Bale 10/10
2. Keaton 9/10
3. Pattinson 9/10

Bruce Wayne,
1. Keaton 10/10
2. Pattinson 8/10
3. Bale 3/10 (I loathed Bale's Bruce Wayne; I know a lot of people liked it)

Over all,
Keaton
Pattinson
Bale

None.

All miscast, especially the too short Keaton.

Also, those films suffered from a lack of action and fight scenes or weak boring fights with clumsy kicks and punches.

Though I thought they did a great job giving Keaton more hardcore fight scenes in The Flash.

I enjoyed him in that more than the two Burton films.

That said, so far, Snyder/Affleck’s is the perfect and only worthwhile live-action version of Batman.