MWJB thanks for your thoughts.
“How did you normalise the brews to ensure as much of an apples to apples comparison?”
The a a bit of a tricky one.
A review is one thing, a comparision is a very different beast.
For example, some grinders/burrs produce their best espresso at different ratios to others. I’m using the Niche for a 1:2 ratio ristretto type pour and it works well with the Nurri. Flow rate is around 1ml/sec so it’s obviously a fine grind. But I doubt that would work so well on a Lamon P100 using SSP Multi Purpose burrs. So to set up all of the variables the same for two very different grinders would tilt the results in favor of one.
That being the case with a two burr set comparison, do I set all the variables the same e.g. grind size, gring to pour weight ratio, temperature, pre-infusion, pressure profile, and have a like for like comparison?
Or do I recognise that every burr set is different and find the best set of variables to get the most out of each grinder?
One solution may be to only compare similar burr sets e.g. two smaller conicals like the Varia VS3 and Lagom Mini or a Mazzer 64mm burr set to a Gorilla Gear 64mm DLC burr set. Or two big burr sets like the SSP HU (or MP) 98mm burrs with the 83mm DLC burrs from Turin.
And if there is not an obviously similar comparision to be had, then to simply review a grinder on its own merits and refrain from the temptation to compare apples with oranges.