There's another option...no splitter at all.
When I moved here to Central Oregon last August, and was intent on heating exclusively with wood, I envisioned myself buying a hydraulic splitter and then having rounds delivered and spending part of my spring & summer every year splitting and stacking.
Well, having burned through a season now, on CSD I bought last fall (nearly 7 cords of softwood), I'm re-thinking my thinking. I can buy CSD for about $165 - $175/cord. I can buy rounds of the same wood delivered for about $150/cord. Even when I buy the CSD, I find there's plenty of additional hand splitting to do to keep me busy (love my Fiskars axes), as well as all the stacking, kindling splitting, hauling, burning, and stove tending/ash removal. I've been burning in two stoves in separate buildings (house & workshop), wife & I both retired, so here pretty much all day every day. At times it's gotten to be quite a chore. I enjoy it, but I'm turning 60 this year, so realistically, I'm not going to go out into the woods felling, limbing, bucking, splitting and hauling...that's fer sure. The point is, that for me, the difference between buying rounds and having my own splitter, or buying wood someone else has taken the time to split means about a ten-year amortization time on the cost of a decent splitter...not even taking into account the cost of fuel, maintenance, repair, storage, etc. Hell, by that time, I might be fuel myself.
It all depends on your situation, I guess. If I lived on a lot of acreage and had easy acess to plenty of wood that needed processing (and I were a younger man...I ain't as good as I once was), I'd probably have a splitter. I'm a Mechanical Engineer...I love machines, and would love to have a splitter...but the economics of it just don't make sense in my situation. Rick