Hi! You can check in detail in new dev logs I post main difference, but will explain again, doesn't hurt ;) No difference in gameplay, both versions are the same. But, loader is crucial. SP version much faster load game parts (in few seconds), especially with default kernal. In some game revisions that was some "cons" about slow parts speed loading, so, with SP version there is no anymore slow loading ;)
(p.s. Loader in "normal" version, covert bitops loader, is also great, it support almost any drive combination including sd2iec which I choose it from start, for compatibility reason)