I think Harrow Sweet had the highest brix because it’s our home grown product. We let it fully ripen resulting better taste.
Abbe Fetel, Comice, Concorde, Magness, Potomac, Taylor’s Gold all bought from the Cornell Orchard store. Even then, they tasted really good. I bet any of these home grown varieties would rival Harrow Sweet.
Of all the one we tasted, we detected some acidity in Potomac compared to the rest. To me, it was a positive element as it made the taste more balanced and interesting. I think, in the end, they all tasted similarly, all are excellent, sweet, melting pears. You can’t go wrong with any of them.
I’d say Abbe Fetel and Potomac are large pears. That counts for something Harrow Sweet and Comice are on the other end.
Fire blight is a serious pear issue and should be taken into consideration. Since there isn’t any noticeably diference in their eating quality, I would go with varieties that have good disease resistance in your area.
Keep in mind, diseases or disease resistance can be regional, too.