I confess that my splitting outfit is no showcase of craftsmanship. I use a hardware store Collins 6lb traditional maul and a 4lb Collins Michigan style axe, both with synthetic handles to better stand the occasional overstrike. I will not use wedges for splitting as nearly every injury I've seen related to splitting came from a shard or an entire wedge flying off at an unexpected angle. I'm usually splitting Douglas fir, red alder, western red cedar, and the occasional piece of hemlock. I do prefer to attack a round from the sapwood after finding a promising looking crack to work and I find that being able to hit the same spot consistently is key. Alder splits beautifully and usually I can get by with just the axe. I once made the mistake of naively accepting some large (3') diameter poplar rounds from a co-worker who had a tree taken down on his place. Not only did the poplar not produce much heat when I finally got it dry enough to burn, but the twisting, interlocking grain and surprise buried knots made it an absolute devil to split. Despite my stubborn pride at never having been "defeated" by a round no matter the size I ended up giving up on about two-thirds of the rounds and chucking them on my burn pile.