For indicator fishing I don't think any line compares to Airflo's 40+. It is basically a shooting head floating line. With a very short head it quickly and easily loads your rod while sending your indicator to the other side of the lake. I haven't cast Rio's nymph line. But would be wary of a "long head" line for turning over indicators. Sounds like S.A.'s Nymph line which is old technology.
I looked at Rio's line and it is very similar to what flyguy got from S.A. Who sells airflow??? I have heard good things about their dry line as well but never see um...hmmm spending too much time in the valley and not enough in surrey maybe??? I will look up the nymph line on S.A. and see what it says exactly..
head length is 66.5' total length is 100'
Specialty Taper
Applications / features:
The perfectly balanced nymph line - now made with new Dry Tip Technology for fly fishing's ultimate floating fly line experience
Powerful front taper for longer casts with weighted nymphs
Easily turns over bigger flies, indicators, and shot
Better mending, stack mending, and roll casting
Ideal for nymphing in big water, especially when using single-hand spey casting techniques
Two-tone color helps you know when to recast
New orange indicator tip helps detect strikes
Taper characteristics:
More powerful front taper turns over weighted-flies, split-shot, and wind-resistant strike indicators
Extra-long compound tapered head improves line control, mending, and stack mending
Extra-long head length allows single-hand spey casting and overhead casting
Larger tip diameter, with Dry Tip Technology, for optimum floatation
High-floating for easier mending and better strike detection
Core