Those two speakers aren’t even in the same league. Sopra 3 are like four times the cost of the One.R.
In a similar vein, I listened to the References back to back against the Kanta 2s in the same room on the same system. Kanta walked all over the GEs. Wasn’t even close in my mind and those two are pretty much direct competitors price wise.
Based on that alone I’d guess the Sopra 3 would be vastly superior to the One.R. In honesty, I’ve never heard the Sopra 3 just the 2. However, having listened to the Sopra 2 a number of times it wasn’t a big enough step up from the Kantas to justify the price. Still ones got to listen for themselves as preferences vary. Good luck.
