I like both, and prefer each for different situations.
Regular > kettle.
For one thing kettle chips are like sharp bits of pain rather then normal chips you can actually chew plus generally from the ones I have had they tend to be weak on flavor.
Not to mention kettle chips are more expensive.
Love Kettle, there's a difference between stale and crunchy.
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Kettle is like hard stale versions of regular. It's like chewing on razor blades.
Regular Lays or some shit is just a mushy greasy mess.
Delicious.
Kettle chips are dry overcooked garbage.