Box wedges make a lot of splinters. Never been a fan, but they are fast at getting wood into small pieces. If your going to be sticking with smaller (24" and under) logs. I'd suggest a 6 way hydraulic wedge over a box wedge. I also seen some interesting modifications of. 6 way, that boxed in the ends, but you were still able to center it on the log with the hydraulics. Just something to consider.
I was speaking with my younger brother this morning, were still set to start building my mini processor/splitter this winter. Among the topic of conversation, a hydraulic wedge thay easily changed from a 4 way to 6 way is a must. We debated a log lift vs making a log ramp, with winch and a saw to pull full logs up, cut on the splitter, then split. Problem with that is I need everything fairly portable and small enough to get on the trailer with the tractor when I go to my dad's place and brothers place to do their logs. I Hate handling the wood more then I have to.