Never played the prophesy.
The piranha had a lot of versatility but it did the modern Maiden / Priest sounds the best to my ears. It could do thrash stuff as well. I don’t know if it would work the best for chugging. Make sure if you get one that the front controls are all functional and don’t skip around, makes tweaking tones a lot easier.
H&K access sounded good (better and more flexible than the Piranha imo) and a little bit more modern but the units are a little finicky, if I remember correctly the one I sold had some of the internal connectors come loose in shipping.