To be honest, I don't know if the radius on some of the tenor brands mentioned are on their Concert and Soprano models or not.
I particularly like the 12" radius in my Mya-Moe Koa Tenor Classic Ukulele. I find it a very comfortable neck to play.
I think a radius helps a little bit for barre chords. But it doesn't make as much difference as a very low setup does. Especially up at the first few frets. The second thing I found that makes a big difference is making sure my hand, wrist, arm and body postures are correct.
My wrist and fingers were really starting to hurt a lot with even short practice times. It turned out that the way I held my left arm and bent my wrist was a major reason why. And the way I wrapped my fingers around the neck and placed my thumb behind also added to the discomfort.
Brad Bordessa's book "Left Hand Technique for Ukulele" and his recent, more extensive online course of the same name has helped me to revise the way I place my left hand when I play. I'm still undoing some 5-year old habits I have. My hand and wrist feel much better and my body is less tense now from playing. Though my arthritis does bother me, it isn't as bad as it was.
I have no connection with Brad or to his books or courses. Just a happy customer.