I am at the end of my obligatos life span. I liked the strings fairly well, but don't have alot of experience diffrent with strings. How do Obligatos strings compare to superflexible? I see that they have alot more tension from the chart. Will they seem pretty stiff if I switch? Which are darker? Do they have similar sustain? I am a jazz player, but I bow quite a bit for intonation practice. Thanks for the imput.