They are part of the same tool kit, I can see the difference, but it seems you cannot see the similarity. You ever heard the expression, "you don't bring a knife to a gun fight"?
Nuclear weapons are a deterrent against Nuclear weapons firstly, and against a larger or superior conventional force...
Trident subs have sealed orders aboard, in the event that the UK comes under attack and the chain of command is taken out. I have no idea what those orders are, and they are I understand reviewed with each new parliament, I suspect some of our leaders are far more willing to retaliate than you...
Trident is more of a snipers rifle, than a pistol. The idea being, no one knows where they are, so they are difficult to take out. It is a good deterrent.