You definitely want a hardened 0.4mm nozzle for when you want to do anything abrasive (wood, carbon fibre, glass fibre, glitter etc) and they last longer anyway.
0.2mm is good for fine details like inlaying text onto control panels (needs AMS or manual colour change) or if you're into small decorative pieces.
I didn't find any benefit in speed with a 0.6mm nozzle but it is supposed to be stronger if that's an issue. Run something like TinMorry's PETG-GF and you won't have a problem with the parts needing to be stronger
I wouldn't bother with ABS myself. It smells, is toxic, it warps hideously and there's other filaments that do pretty much everything it does but easier. PETG is my go-to as it's a bit more flexible for hinges, catches etc and isn't so brittle as PLA. Also a bit more temp tolerant. PLA will sag in a car (in summer at least!) but PETG should be ok. If you really need high heat there are other filaments like PET-CF (no G) that will go to about 200°C or various nylons (need to be dried) or PC.
Most of Bambu's filaments state you need to dry them thoroughly before use. Sometimes you do, sometimes they're fine. I've been running Sunlu's PETG for many rolls and never had problems not drying a new, sealed roll. Ditto for the Tinmorry PETG-GF. Dryer is useful but either for exotic filaments you want to make damn sure aren't going to make an expensive lump on your print bed or for stuff that's been hanging around opened. If you get a new basic roll that's too wet, you've either been unlucky or it's a bad choice of brand.
PETG is likely to do 99% of what you need. PLA might do overhangs better...or it might just be my layer fan is below spec (it is known to be). Also more colours in PLA as it's more popular - people think it's easier.