Talking log splitters is like what oil ratio and brand of mix oil .Many debates about same ,Now some facts .Most splitters use 3,000 pound hydraulics and most hyd pumps are factory set at 2750 .For example at 2750 PSI a 4 inch cylnder is around 17 ton and a 5 inch close to 26 ton .To reach the tonnange they are advertised would take 4,000 pound hydraulics exceeding the ratings of the components .In other words they lie .Of all of them made "timber wolf " is one of the few that are honest .They rate their 5 inch models at 22 tons .
As far as engines sure Honda makes a danged good engine but any engine will work .An 8 HP used Briggs engine with a 16 gallon per minute will suffice nicely .If you get on Graigs list they can be bought relatively inexpensive .My home built has an 11 HP Briggs I bought for $200, electric start and a 5 inch cylinder .