What is the best type of flooring material to put in a kitchen?

Okay, you don't know me from a hole in the wall.
But I obviously don't have anything to gain or lose from this advice so you might want to listen.
I'm a guy with almost 40 years in the construction trade as a carpenter,
I've renovated about a thousand kitchens.
...AND I cook, so I know my way around the kitchen.

Go with linoleum.

Ceramic tile will last longer but it doesn't clean easy and it stains.
Any sort of organic, like wood bamboo or cork are susceptible to moisture and stains.
I don't care what the salesman told you, those laminates like Pergo will only last 5 years.
(if you're lucky and very clean)

Go with VCT (vinyl composite tile) over a new sub-floor
or good old fashioned linoleum.
Not the "self-sticking" tiles, the heavy sheet stuff.
...and get a pro to install it, it's worth the expense because it will last forever.
You get what you pay for.