"Begins" gets my vote as it's simply my favorite live-action Batman film! It focuses wisely on the (really well-played) title character of Bruce Wayne, himself, and it's tone/visuals nail the look and feel of a Batman story, without going the full-on gothic route. Also, its 3 villains are superb!

I guess it might be nostalgia

Better aesthetic by far, snowy mountains and later warm brown colours. Music is much better with the full on James Newton Howard Tracks. Fight scenes with batman are better, they mimic something vicious with fast cuts. Batman voice and suit is better too. Prefer Bruce's development much more as well

Just watch Cap's videos on Begins. Also, The Dark Knight's ending has aged really poorly for me.