If I were limited to one handgun it would be a revolver.
I know you said you have never owned a revolvers but a K frame S&W in 357 magnum is the most versatile handgun you can ever own.
It will shoot everything from light 38 special target loads to heavy magnum deer hunting loads. Bullet weights range from 105 grains all the way up to 200 grain .
Any power range and any bullet profile can be fired in a revolver.
That can't be said of a semi-auto.
A model 66 would be sweet and there are many police trade ins that show up if money is an issue.
I have a trade in , carried a lot , shot seldom and the stainless steel shows little wear.
Gary