I think the woods used have a lot to do with which strings sound good.
My CR has a sequoia top with walnut back and sides. I tried the Aquila, Worth Clear (heavy tension) and Southcoast's smooth wound (ML-SW)low-G sets. I like the sound of the Southcoast set the best, with the exception of their wound C which produced a weird harmonic. So now I have the Southcoast A, E, and G, and Worth's C, and my CR now sounds balanced, warm and full to me.
My CR is all Koa
I use a Fremont Soloist polished flatwound LowG with T-2s
I tried all kinds of strings and I also liked the Savarez Classical guitar strings that Rick likes...but the T-2s sound nice to me been using them for 7 months now...
waiting to see what/when the Oasis tenor strings come on the market and I will try them