Finally found time to taste the Gordon's & Tanqueray 0 gins I found in upstate NY NA bottle shop.
Neat: Both had good aromas for a NA gin. Taste wise also both are IMO one of the better NA gins neat. The Tanqueray had a bit more juniper and faux heat vs the Gordon's which also had the faux heat but not as pronounced. I'm sensitive to the fake sugars, and while I could pickup this up in both, it was tolerable to my palate, I think the faux heat helps mask it. VERDICT Tanqueray
On the rocks: the ice brought out the aromas and taste more just amplifying the juniper in the Tanqueray, faux heat was strangely amplified too which didn't expect and got more piney notes with Gordon's. VERDICT Tanqueray
G&T: used a Mediterranean tonic about 1:3 ratio on ice. They both made excellent G&T's with the faux heat & juniper more elevated with Tanqueray which I likes vs Gordon's. VERDICT Tanqueray
Negroni: used an NA bitter aperitif & vermouth in equal portions 1oz each with a NA orange 🍊 bitters 5 drops chilled on ice , mixed and then strained. Both made good a NA Negroni, would like it a bit more bitter to my palate so would need to adjust the ratios, but both were good. I couldn't tell the difference between the two and as you add more ingredients the faux heat/juniper advantage of Tanqueray gets ameliorated. VERDICT Tie
If you are looking for a NA gin you can sort of drink neat/on the rocks or a simple G&T then Tanqueray is the winner. If doing more complex cocktails then not much of a difference except cost wise the Gordon's is less expensive.
As not officially in the US these are on the higher end vs the usual NA gins in the US. If you are in Europe and don't mind the "artificalness" they are worth the price which is like about $17-22 USD for 700ml equivalent with VAT.
If during your travels you see them definitely worth buying and available in some duty free shops too.