Not sure if this is of help as I recently upgraded my A3 pro with a 10w Endurance laser, but I have experimented with cutting about 15 species of wood, plus laser grade veneered mdf, laser grade plywood - birch, poplar & veneered. I have found solid wood is much easier to cut that mdf or plywood.
The easiest of woods to cut (in no particular order) were beech, walnut, pine, poplar. I haven't tried cutting balsa as it is too light a wood for the type of work I do, but assume it would also be pretty easy.
Oak is also cuttable but the grain can be an issue, so not always consistent.
Mahogany, utile, sapele - very difficult to cut
Hope that's of some help!