Lay's (Walker's in the UK) are nice, but always half-filled.
It's Nitrogen they put in the bags to keep the crisps fresh, if I recall correctly.
But I definitely think that Walker's overcompensate for it, or at least in their traditional crisps.
Things like Wotsits, also by Walker's, don't seem to be too bad.
I also didn't know that Walker's was an original British company and created the iconic Walker's/Lay's style crisps, and that Lay's later bought the company and introduced the style to America, but leant their logo to Walker's.
And now they're both owned by PepsiCo.