Echoing what mauman said, there are a number in the range you could try, rare and common, expensive anr affordable. I'll definitely agree that the soviet era ones are excellent replacements in other circuits requiring Ge clipping diodes, too (super-fuzz in particular), as well as being slightly more affordable than NOS American fare.
As far as tonal qualities… you'll get differing opinions, as well as differing opinions on whether or not there needs to be a difference if opinion

If you want my most neutral of 2¢, I'd say experiment to see/hear what you want out of it, but I know that cost can be a factor. Heck, I couldn't decide so I made a board with switch-selectable pairs. You could go totally unorthodox and try silicon diodes, LEDs, or even two-legging certain transistors. Although I'll admit my own bias was "screw the mojo" and find something I liked the sound of with this circuit, so take that with some grains of salt.
I found this article/page to be a nice inspiration:
https://www.guitarpedalx.com/news/news/a-brief-hobbyist-primer-on-clipping-diodesIf you want my subjective 2¢, help yourself to a whole salt lick

. I found these to be my favorites/ranking:
1N270
1N60P
BAT43
D9E
1N5817 (noticeably quieter)
Hot take: i found the three versions of 1N34A I had to be too farty/dull and I personally don't recommend them at all.