Red Dead Redemption remastered for current gen consoles and PC would definitely be my choice followed by a remake of the excellent Bully but with all the humour intact (without any tiresome politically correct editing if you please!).
GTA IV would take more than a remaster for me to play it again. It needs a full on remake. The game sucks and no amount of fancy graphics and performane improvements is going to change that.
Not interested in Bully. It's trash. Table Tennis is a joke answer.
The only real answer here for me is RDR but of course Rockstar abandoned that because they realised they couldn't hire some shitty ass mobile studio to do it and that they'd need to do it themselves. They ain't got time for that shit when they are busy milking idiots dry on GTA Online and working on GTA VII which they will use to milk idiots dry well into the 2030's.
I want all the processing power of Ps5/SX/PC put into a single room with 2 players. 4K/120fps, the most realistic animations ever. When I loose a point I want to see the disappointment in the face of my player, when I loose a tournament I want the light in their eyes to fade ever so slightly.
GTA IV because it had the best city but it also looked very ugly at times (foliage looks awful) and it's the worst performing game in the series. It's was held back by the hardware more so than the other games in the list.
If they remade GTA4 they'd get rid of the cool physics engine
I'd say Bully but I don't even like Bully that much... I remember distinctly looking forward to the game because of all the controvery making me assume it'd be hardcore, it's Rockstar so UK devs right??? (lol) + I knew the main character had a shaved head so I figured I'd get to be a proper chav prick. Thought I'd be sneaking knives into school, bricking houses and napping dogs to use as bait for bigger, harder dogs in some sort of dogfighting arena minigame
Then I realised it wasn't Rockstar North... then I heard the kid's American accent when I started the game and immediately got pissed off. This kid's school doesn't even have a metal detector or drug dogs. Pussy shit.
What I'm saying is they should remake Bully but according to my ~artistic vision~ as outlined above.