Flat burr grinder

Conical please.

Below, what Google's Generative AI [https://www.google.com/search?q=flat+v+conical+burr+coffee+b...] says about this:

Consistency: Flat burrs are known for being more consistent and producing a more balanced extraction

Noisiness: Flat burrs can be noisy and heat up quickly without good ventilation

Price: Conical burr grinders are cheaper than flat burr grinders

Coolness: Conical burr grinders are cooler than flat burr grinders

Gentleness: Conical burrs are gentler on the coffee beans, which can result in a sweeter cup of coffee

Control: Flat burr grinders offer more control, which is good for cafes or commercial uses

Espresso brewing: Conical burr grinders are good for pulling espresso shots

Grounds: Flat burrs often retain more grounds than conical burrs

This is a bit inaccurate, and that is reflected in the top results when you google it.

Conical burrs are not cheaper. You call this when you look at them, the shape is pretty complex. They often don’t have good (low) retention as they are often on massive commercial equipment. They are consistent as all hell.