Hey
For me the best wood splitter (and cheapest) is probably the ax. The double-sided blade makes the Penetration into the wood so easy.
Of course there are also the mechanical log splitters. These are usually worth buying if you have to often split a lot of wood and you do not feel able to hack the wood yourself.
You can read more about log splitter here:
https://allaboutsaws.com/best-log-splitter/ There you will find a lot of tests of log splitters from various brands. That may help you with the purchase decision.