Much better choice! Galactus is very powerful, and would give a ton of fictional characters the back hand. However, Battler is above him by quite a margin, believe it or not. Battler's Endless 9 can negate any form of fictional attack, be it universal or multiversal, due to his ability to be able to amplify anything he does, be it a punch or magic, from 1 to infinity. Only characters with conceptual attacks, on a multiversal scale, have a chance of touching Battler. Also, his main weapon, Golden Key (that golden longsword) is the physical form of truth itself; meaning it cannot be blocked, dodged, slowed, avoided, or stalled, and it ignores concepts, such as time and durability.
In other words, this guy is so OP, that it's gonna take characters as strong, or stronger, than top tier DC and Marvel characters to beat him. But rest assured, I promise you, there are plenty of fictional characters who can put him down.