I think as @tompoland says, burr geometry is playing a big part in my findings. I know thereās a subjectivity to it but Iād be surprised if anyone else wouldnāt notice the same as me (thicker body on the flat) with the exact grinders and coffee Iām comparing.
Comparing the Niche to my C40, the burrs on the Niche are 50% larger which will inevitably be making a big difference.
Perhaps a Niche vs a Super Jolly is a better side by side comparison. Even then I think there are too many other factors to say a once and for all āconicals taste X, flats taste Yā.
I donāt know how much each of these affect the result but youāve got motor speed, burr alignment, burr orientation, burr teeth design, how seasoned they are etc etc before you even get into the coffee, age of coffee, how fresh it is, how itās been stored, if itās single dosed, WDTād etc etc.
A lot of factors.