Maple has been dominating the batters box for the last 20+ years. Maple is the most used wood species in the pros. It is the most dense of the three wood bats and strongest all around.
However, since maple doesn't have much give or flex - more energy is transferred upon impact at the plate.
The downside to using maple is that the "sweet spot" is smaller than other woods and it is not as forgiving as other wood species on a miss hit. Since there is little to no flex hitters who drive ball off end of the bat or hitters who don't like to crowd the plate may want to look towards Birch or Ash as a better option.
Birch is known to be the best of both worlds when compared to maple and ash. It has been becoming increasingly popular among players of all age groups.
It has similar density properties as maple yet has more flex and is more forgiving on miss hits.
This is especially a great option for new players to wood who do not want to pass up durability for performance and also suitable for players who are playing up a division or age