The only thing that is interesting about a hotspot is how many tons per hour you can mine in that hotspot in that particular ring
And it's the ring that matter - aka all tritium hotspots in a certain ring will have the same yield when mined at the same distance from the center (for laser mining it's important to mine within the 10% from the hotspot center)
However, not all rings are the same, some are better, some are worse, but the only way to know that is to mine in those rings and write down some statistics
In ideal circumstances, yes. But we don't have those, as noone would go out and explore mining yield in remote hotspots, and noone can really expect the OP to do test mining. So I wondered if anyone has come up with a way, not to estimate yield to some acceptable accuracy, but to say 'in this neighbourhood of space, system A appears to have better trit hotspot(s) and locations than system B', and so system A would be preferrable as a temporary location of exploration stopover, as mining tritium could be expected to be 'better'.
Your last statement seems to say that visual appearance (i.e. 'fat' part of the ring, vs 'thin' part of the ring where the hotspot is located) have no correlation with mining yield, everything else being the same. Is that a correct intrpretation?
I should perhaps add that I'm not interested in comparing hotspots within a system, only compare the hotspot that appear to be the best in system A with system B. In 'best' I include distance to entry star: a perfect hotspot 400kls away from an entry star is of no interest in this regard, and might as well not exist. And if I imagine myself to be in the OPs position, a system of estimating quality that at least has a rough repeatability, would be desirable. If I may be fancicul, it would be like those 'information to ships' documents published by the UK government in the 1800s, that said that 'the lagoon of <atoll X> is at least F fathoms deep. A cache of ship biscuits and tins of preserved oranges was left at the northern top of peninsula <P>. Local fish supply is more than adequate.'