A good reference site to look at is "logssplittersdirect". They rate splitters in consumer-prosumer-professional use categories.
I use a Swisher 28 ton that came from Rural King on mostly insect killed white and red oak,borer killed elm along with hickory, cherry and black/honey locust. It has a cold weather hydraulic by-pass for cold weather warm-up and does a really good job for moderate duty farm use which is about 8-9 cords per season for me. Operates in horizontal and vertical positions.