I'll be just fine with my Mr. Knight (which I hope HT makes and gives him an Isaac sculpt plus some cool extras) and hope they give him another suit moving forward. I'm rooting for the Shalvey look personally:
The all-white is the classic and has a unique look, but I like how the new one has him blend into the night with the black parts, making the chest armour stand out and create a crescent moon, same with the hood and the head. I get the Egyptian theme of the D+ suit, and I like the idea, but MK's design, name and lore never made sense. He's a "Knight" but has no armour (or Code, or anything tied to the concept), he dresses like a ninja themed like a ghost, and the Egyptian bit is lot beyond the Moon insignia. So going purely off aesthetics, I think the Shalvey/Ellis look works best. It's armour (Knight), it's got the Moon bits, it keeps the Spectre look, and the centre armour looks like an Egyptian collar. Plus, it wouldn't dirty as easily as an all-white suit, which could face the same problems as this one, meaning it looking "unpainted". Not to mention, with the Shalvey/Ellis look, there wouldn't be a problem of the mixed media not coming together. The black would be cloth/soft goods and the armoured bits would be plastic as usual. None of that cloth-bandages-sculpted-and-looking-cheap nonsense.