The circuit matters. Many of the renowned vintage 6SN7GT will have problems in slots sensitive to noise/microphonics, like high gain preamp slots. Plus some circuits may rely on the higher voltage rating and/or plate dissipation of the later GTA/GTB series; a GT series may not last as long in there. The 5692 has an even slightly lower max plate voltage rating than GT, so you need to know your circuit's demands if you choose these. Many of the later GTA/GTB series have a LOT LESS problems with microphony and noise, in my experience - but at the expense that they aren't as sweet sounding as the best GT-series tubes.
From what I've tried - including the Red base 5692, Slyvania VT231, Slyvania brown base WGT, Ken-Rad black and clear glass, RCA gray glass, Sylvania GTA and GTB (short and tall), Tung-sol GTB (tall), etc - the Tung-Sol 6SN7GT round plate, black glass (RPBG) was by far the sweetest sounding of all. Sonic beauty incarnate, but very hard and expensive to track down. NOT for those tracking down "ultimate neutrality/accuracy" (I think that goes for 6SN7 in general). My close friend also has the Russian "holey" military tubes described in prior posts (whatever the "best" kind is), and he swears these are at least up there with the Tung-Sol RPBG, if not better. He has an amazing ear for things, so I believe him. But yes - all the other types I listed do sound quite good - none are "bad".
The modern, inexpensive Russian & Chinese 6SN7 aren't awful - quite serviceable in fact - but you'll definitely get a sweeter sound from tracking down some good vintage tubes. The Electro Harmonix 6SN7 was particularly "solid state" sounding in character, when I tried it. I haven't tried the premium Chinese 6SN7 types yet; they certainly have their fans but are also quite expensive.
Last time I used 6SN7 I settled on the Sylvania 6SN7GTA "tall boys" for a good mix of sound quality, low microphony / noise, and decent price. I just bought a heap of them again to try in my VAC 200iQ monoblocks. But if I were a rich man, I'd track down heaps of those Tung-Sol RPBG.