Don't be fooled into thinking you have to spend a lot of money or get the latest tool to split ten cords of wood each year efficiently.
The most important tool you have is hopefully your brain. The second most is likely your back. Don't abuse it, because it doesn't heal well is at all. For thirty years I did the same type of wood with this splitter as my SSHD or TW-6. You just do it a little different, for a lot less money. Work out a system. The large rounds below were cut three to four inches deep and popped with a maul and wedge. Nasty stuff got noodled all the way through, sometimes quartered. Get a peavy, a pulp hook, a hook-a-roon, old two handled ice tongues, etc., anything to protect your back and make it easier. It is a process. A big dollar splitter may not be what you need. I bought three twenty cord loads of 8' Oak and used this '70s SpeeCo. Then, over time, I bought a used forklift, and a used conveyor. The splitters I use now came way down the line. This splitter here in the photo has a good working height; beautiful, efficient wedge design; stroke reducing collars on the rod; a detent valve; GX200 Honda; and work table for resplitting; and unlike the popular vertical/horizontal design, the tires/wheels are out of the operators way. (Horizontal/vertical splitter: Horizontal mode: The operator should stand comfortably next to the beam, but you can't because some big city idiot designers that doesn't know what a tree looks like put a tire, engine, or hydraulic filter where your legs should be. Just lean over a little, what's the big deal. In vertical mode the operator is bent over or on his knees, torquing his back to get a large round in place, and sucking exhaust fumes to boot.) The splitter below is a work horse, and all there for very little money. If you can find some fool, like me, selling a splitter like this jump on it. Don't be fooled by some box store splitter with shinny paint. Your just going to drop a large round on their well placed engine and hydraulic filter the second time you use it anyway.