I dunno about Witcher 3. Not played DMC 5 just watched the stream and still want to play it myself (biased fan).
DMC 5 is:
. Comedic: - the animations, characterizations and byplay between characters as well
. Scenic: - there are places where you free fall and are still collecting those blood orbs at the same time. Monster design is also once again on point. V is also very easy on the eyes. (Yes, that counts)
. Challenging: Also, the monsters outdid themselves, varied attacks and weak points. There might even be one that’s easiest to defeat if you juggle it - could be wrong. In any case, I don’t think any of the fighting possibilities are wasted. (Again, this is from just watching playthrough).
. Replay value: I think every character has an interesting fighting style, though I really just want to play V because he’s a summoner/dollmaster type. The pets do most of the fighting, he basically makes sure to resummon them and stay the hell out of danger. Cutest bit - V must do the finishing blow. ^^ Get past that, you still have a dude with weapon arm (similar to Sekiro) and a guy wielding a motorcyle. Don’t think you could get bored.
. Multiple modes: As per usual with the series. Does Witcher 3 have that too? Dunno.
. Story: Seems to keep the family tale going - which is why I didn’t get a few references, but nothing too off-putting if you just want to play.
. Twins: Enough said. ^^