Recently had the pleasure of trying Plymouth. Received a bottle as a gift. I liked it quite a bit.
Always been a huge fan of g&t's, well, except when I was a little kid cuz that would be wrong. Tanqueray and Sapphire, I find, are good solid bases to start with. Tanqueray is a little more bold, but I find I prefer the Sapphire a little better. Brings an extra edge of depth and refinement.
I do agree with you, BlueJays, that Tanqueray 10 is on another level. Really bumps up the smoothness.
Tanqueray does make an excellent, traditional gin & tonic. 10 is indeed a top notch gin. I'm glad you enjoyed your bottle of Plymouth. I have always been interested in their Navy strength but can never find it.