Three-point! No contest. No maintenance, mine works like new 15 years in. Originally it cost about two thirds the price of a stand-alone with a GOOD engine. There's no small motor fuss on a cold, rainy winter day. Since I have better things to do on nice days, I am usually splitting in foul weather. I Back the tractor up to my woodshed just enough to get the splitter under cover. With the splitter on the 3-point, I'm not standing in an enclosed space sucking up small-engine gasoline exhaust. The diesel exhaust pointed in the other direction about ten feet away is blown off by the wind.
Only issue is making sure you have compatible couplers on the tractor. Hydraulic hose couplers are the one thing NOT standardized in the machinery world. If not compatible, assuming you are not a hydraulic pro, budget a couple hundred more to switch them out. I actually loaded up my tractor and splitter once and trailered down to the hydraulic shop to ensure I got the hook-ups right.
Finally, ignore all the nonsense about using a front loader to load an unmanageable round onto a stand-alone splitter. Assuming you don't knock over the splitter, by the time all the maneuvering is done you could have chain-sawed the block lengthwise a couple of times down to safely manageable size (and in my case under shelter out of the rain).