I use a little of both depending on the season, how I'm wearing my hair, etc. I tend to use natural shampoos, but more conventional conditioners since I use so much in cowashing, DC, leave-in, etc. I try to keep it paraben, silicon and sulfate free for the most part though.
Shampoo
Giovanni - Smooth as Silk (sulfate and paraben free)
Giovanni - 50:50 (sulfate and paraben free)
Conditioners
Tresemme Naturals (not completely natural, but paraben free)
Trader Joe's Tree Tea Tingle (more natural)
L'Oreal EverCreme Conditioner (not completely natural, but paraben free)
Yes to Carrots Conditioner (natural, I think)
Aubrey Organics Honeysuckle Rose Conditioner
Stylers
Ecostyler Gel Blue (havent used it in a while)
Kiss My Face Upper Management Gel (very natural)
Curls Goddess Gel (natural)
The rest are oils, butters, herbs, etc.