I mostly would like 6 to be remade first since I think it really gets overlooked even though it’s one of the best ones but 8 really does need one and a lot of things need tweaking.

None tbh.

I'd personally pick 4 but out of the options I'm going with 6.

A 3D remake of VI could be fun. Provided it doesn't end with Kefka winning and cut World of Ruin entirely.

The one with Kefka cause I find the character very fascinating

That'll be VI. They'd give him a voice too, probably Dave Wittenberg like in Dissidia, and he channels Mark Hamill to highlight Kefka's resemblance to the Joker.