I have an order for a Tonebender MkIII with an on-board voltage inverter (so it can be used alongside standard negative ground pedals) which is built with modern components, which are smaller and have closer tolerances.
I thought I'd build a 'vintage correct' circuit at the same time, using NOS Mullard C280 'tropical fish' capacitors, axial electrolytic capacitors and polystyrene capacitors, along with carbon-comp resisters.
It'll be interesting to compare the two against each other when they're built. I suspect there will be little between them - and any differences would more than likely be down to the transistors than anything else. I don't think there's any right or wrong way of doing it. Some people like the 'mojo' of using vintage components, so it's just like the original units, whereas that sort of thing doesn't matter to others.