It depends what you intend doing with the drill.
The smaller percussion type hammer drills really struggle in some masonary and concrete.
Whereas the larger 24V and up pneumatic type can be as good as corded drills.
Then there, the choice of battery size, and charger speed.
I use an old 24V Bosch drill with two 3.0AH batteries and a 15 minute charger. The batteries have the added bonus of an LED display to show the state of charge.
Some of the larger drills have rotation stop, which is good for chasing.
You might also consider what other tools you may have, or want to obtain in the future. It may be usefull to choose tools that can all use the same charger