This is a weird one and may surprise some people, but I'm going to give best crisp to Cheese Moments.
One of the strangest recipes for a crisp ever, it includes a soft cheese center coated in a crisp shell which, when it bursts releases the synthetic cheese center into your mouth to dissolve in an explosion of bizzare flavour. No other crisp has the balls to include a soft center so for that reason, it's number one.
Runners up: Monster Munch, Chipsticks, Squares, Nik Naks.
For those who aren't aware, the UK is in a long time love affair with baked maize.