This may sound like an easy question, but considering the original Twilight Princess came 3 years after the original Wind Waker, the game is theoretically more advanced graphically. But... WWHD got a better treatment with new lightning and effects, wether TPHD looks like a resolution/fps revamp with less aliasing and more vibrant colors.

So... which looks better overrall?

WWHD obviously, but I think a more interesting question is which looks better - Twilight Princess HD or Star Fox Zero?

But yeah, to say on topic, easily Wind Waker HD. Even if we put aside subjective preference, Wind Waker's art style has just aged better than Twilight Princess's. Twilight Princess needed a lot more done to it to have even a lick of a chance of competing.

WWHD, no question.

Star Fox Zero without a doubt.

I'd argue TPHD without a doubt.

I hope that after I play TPHD, I will notice a bigger difference than I do now.

After playing WWHD, I cannot go back and play the original. They just improved it so much (elements of gameplay as well). I feel like I will not have the same feeling after playing TPHD, but who knows. They need to announce more about it.

Twilight Princess.

I'll go with TPHD, I'm sure the game will reach constant 60FPS, something that WWHD couldn't do.

Dolphin

I mean WWHD.

Well tbh I still prefer TP Dolphin over TP HD.

It's tough to decide between Star Fox 0 and TPHD, but I guess Star Fox is a bit better overall. But if it was Skyward Sword vs Star Fox Zero, I'd say Skyward has the edge tho!