Salt and Vinegar. Most types.
Seem to be a lot of love for S&V kettle Chips on here but I find they don't have enough flavour. A good quality crisp though.
Seabrook S&V are amazing. Pringles just brought out a 'posh' S&V flavour that was very nice. I like the regular ones too but I find it's too hit and miss with how much flavour will actually be on the crisps.
If you can't tell, I like a lot of flavour on my salt and vinegar crisps!