Great question!

I believe going from the two’s to the One’s was a huge improvement.

Going from the One’s to the reference was big, but not as huge difference as the earlier.

If I had to do it again, I would buy the reference speakers all day long, because after listening to them there is no going back they are better in every way.

Good luck!

I appreciate this thread, as I bought a pair of Triton Ones new in 2017 and might be making the upgrade.