Can consider F731 (economic pack of 50's) or F730 which is its individual packaging.
I've F731, F730, before I got 4-Ply Good Manner White (price on the higher side), then F919, Prism Black (but too thin so using only for outdoor/brisk-walking, and F929 as I was looking for some black ones for a change.
Primarily leave home using F731 these days.
Avoiding F808 and F912 as I feel they'll be too big, from what I've been reading here.
Edit: I use these mask stoppers to tighten whenever the need arises. Posting random link just to give an idea.
https://shopee.sg/-SG-READY-STOCK-M...0?sp_atk=5def9d25-4ebb-49d8-9df1-78957bee941b