I'm a fan of Evah Pirazzis for my violin, so thought these would be a safe bet as the first set for my new viola. They give me a rich, powerful sound and I feel the sound is very controllable. However, I will be trying some other brands the next few times I replace strings.
These work much better than the Dominant strings that the shop installed, but strings are always a personal thing; what works for me might not be the best on every instrument or for every player.
They're quite expensive, but there are some things it's not worth compromising on. Having tried various cheaper sets a few times on my violin I don't have much confidence in the sound I get if I try to economise.