Very hard query to answer. They each are very warm-sounding speakers, and I in my view like each of them.
focal theva I even have never auditioned, so I can`t tell the difference. however I attempted opticon with focal aria. Aria is much more detailed, and vocals are much more precise. I felt like they had been really good in jazz, blues, Hindustani, and Carnatic songs, however in film songs they're fine however now no longer as great as blues or jazz.
you have to take an auditioned earlier than you purchase they each are surely nice speakers
While you look, the sensitivity opticon is a little tougher to drive than theva. one greater aspect a few people find focal could be very bright sounding so use a matching amplifier for focal to get that warm sounding .
If you are using in home theatre . consider the centre channel to get the LCR combination.