Both of my violas sound and play well with Obligato strings. Currently my go to set is Obligato C, G, and D with a Warchal Amber metal A. On my 1999 Samuel Shen "widebody" viola, I use medium tension for all. On my K. Mroz, 1991 medium for C and G, forte for the D (and medium for the A).
The only thing I don't like about Obligatos is the price.