Which plasters do people find best, ones that don't fall off easily / fray
It depends what you are really talking about. I use Mepore dressings which work well. I did buy a few singly from Sainsbury’s pharmacy - it is now known as Lloyd’s Pharmacy
Or more expensive, there is Opsite which is like adhesive cling film only a superior quality etc..
What are you wanting it for? I have never had problems with ordinary plasters.