I normally use my mora #1. Weighs about 3 ounces, long enough to split down some kindling. You can also use the mora 2/0 which is smaller and lighter at 1.9 ounces. Just depends on how much length you want. I also have a 7 inch old hickory butchers knife I use for serious splitting.
I prefer longer/skinnier blades over shorter/thicker blades. You do need to be a little more careful with hardwoods. Don't baton through knots, flip the piece over and baton from the other side and you can usually get it to split without touching the knot.







