veganwithabeef If you are thinking hand grinder, for espresso using a conical look at Kinu; for filter using a conical look at Comandante; for both using flat burrs look at Pietro.
I own the Pietro and love it; I have a Kinu on order. I also have a Niche Zero, and in a few months will be adding a Duo with both burr sets. All of these are excellent for their purposes without breaking the bank.
Any in the cup improvements may occur (or not), depending on beans, technique, etc – with mid-tier 64mm grinders (Mazzer, Olympic, Option O, Zerno) or the very expensive offerings from Kafetek, Option O, Titus, Wug and a few others.
For me, the very small in the cup differences are not worth spending two to five times the price. Better beans make a much greater, readily distinguished difference.