dutch or uk made real deal old stock gz34’s are best sounding and most reliable, close second are japan-made ones from the late 80’s and early 90’s made on old mullard tooling moved there, these are usually branded matsushita or national, then usa old stock ’big bottles’ are also quite good
how a rectifier will sound, how it will vary in sound, depends greatly on the circuit/item in which it is used, to say they make no difference sonically as a blanket statement is wrong
i have had various tube gear using these tubes since the late 80’s, and still have quite a collection of these