Get OLED and used mario kart or new doesn't matter. Whatever you prefer
People saying the battery is better isn't entirely true anymore because the OG switch had a silent refresh that has the same battery management as OLED.
OLED has a waay better kick stand, of course the screen is gorgeous and the rails where the joycons slide into are metal instead of plastic giving it a more rigid and premium feel
The screen on OLED is glass but has a thin plastic screen protector so if you care I'd get a glass svreen protector. I used one by the brand called Orzly and it's great. The plastic screen protector is there because if you crack the glass it stops it from shattering completely and having glass falling out. So you could remove that or just do what I did and stick a glass protector ontop of it.
But anyway! If the nicer screen, kickstand and premium feel from the metal rails doesn't do anything for you then go with the OG.
Idk if this helps everyone but does for me, lowering brightness down by a lot
If I'm gaming during the day my monitor is from 100-70% and at night i take it down to 40-20%
I think monitor is fairly bright (odyssey g7 32")