As noted already, Tayto and King are both from the same stable so to say. I do prefer Tayto. While I would concede that they can sometimes be oilier, King are burnt more often.
Pub crisps used always be better quality. I canāt remember when I last saw a packet of Tayto Pub crisps but I remember they were ousted by Key crisps and Mr Perri (both in a foil bag).