I can say for sure what is better in terms of cantilevers (i like beryllium on some carts, i like boron on others, and even aluminum on some of them), but i can say for sure that AT-ML180 is better than AT-ML170 and all previous models i have tried. The AT-ML180 was released in 1993 and it was the last and ultimate cartridge in this series. The AT-ML170 was made in the 80s (nearly 10 years earlier than AL-ML180). Earlier version have been discontinued when AT-ML180 was made.BTW beryllium is better cantilever material than boron.
Even better than ’’gold plated boron ’’
I don’t really care what retipper can do with MM cartridge, but that’s the only way to get an old cart back to life (when the original stylus is not available). Remember SoundSmith and his Grace refurbishing (so many people use that option to replace the OG cantilever). And they can do that. It’s not the original sound, but it will work. Using another stylus from lower model can be an option, but in case with AT-ML180 is not the best solution. I think it’s better to buy the whole cartridge + stylus (aka the AT-ML15, 160 or more expensive AT-ML170) than tryin to buy just the stylus from inferior model to make sure it’s not equal to the performance level of the original stylus of the top model supposed to be used with this cart from the start (just a waste of money). The AT-ML150 is not a rare cartridge and the price is not high, so why not just buy the whole cartridge+stylus? The AT-ML180 deserve a much better stylus (the original, but it’s impossible to find separately from the cart). If someone can refurbish ATN180ML (Expert Stylus can do that, they told me) i don’t see the reason not to do so.
p.s. I would not advice people to use for example the stylus from Technics EPC 100c mk1 on Technics EPC 100c MK4 even if they are interchangeable mechanically. It make no sence (imo).