You have picked 4 fairly different headphones and price difference is over £300 from cheapest to dearest.
- Two have bluetooth and 2 don't
- The Grados are open backed which means they leak sound and probably not best in an environment where you might disturb others. Also poor isolation, so you'll hear external noise. They'll have a much better soundstage than the others
- The Airpods are quite Apple centric and very pricey
You'd be best working out how you intend using them, first.
- What sources will you be using (phone, amplifier, etc)
- Do you want/need bluetooth, mic etc
- Will you be using them outside or on transport (open vs closed, ANC or not)
- Will you be carrying then around a lot (rugged and good folding ability)
- Will you be using them for extended periods (comfort - closed back headphones can make your ears a bit warm)
- Price willing to pay
You ask about best sound. This is subjective and ultimately only you can really tell. However, on those grounds alone, then I'd probably be looking at the Grados, primarily for the better soundstage but I wouldn't take them out and about. For a good quality, general use headphones, then possibly the Sony's.
I am not sure I'd risk paying somewhere north of £500 for headphones, without auditioning and comparing them, first.