I´ve been playing guitar for over 20 years now.. (15 actively), and I have used Tortex when I started, then just tried different ones from my local guitar store.. I just got 10 different and tried them all, but really never felt that anyone was better than a tortex.
But then!.. I started practicing more lead guitar (this last 2-3 years), and after lots of readings on the internet, I found that many pro / virtuoso guitarists where using the Jazz III (this are not the "dunlop tortex jazz iii", but just dunlop jazz iii), and as I was reading how great they were, and my local guitar store didn't have them.. I just put an order on eBay and got 12 ;)
From day 1 I was!... Hell Yeah!!.. this are the perfect pick!! And I had a smile in my face the entire day! :)
there may be other great picks out there.. so its important to buy different ones!
Nylon Jazz III: Eric Johnson, John Petrucci, Joe Bonamassa
(there are signature models of at least Eric Johnson and Petrucci)
Matt Heafy from Trivium use the "Max Grip" version of Nylon Jazz III
Mick Thomson from Slipknot use the "Carbon Fiber Jazz III"
and Kirk Hammet has his own signature of Jazz III picks.. they are maybe more like the "tortex jazz III" I believe. (haven't tried them)
then Paul Gilbert use Ibanez Cesareo 1mm or his own signature ones based on that model.
Satriani use D'addario picks (planet waves) .. his own signature model.
Vai use Ibanez Signature picks.
All in all.. Im glad with my nylon jazz iii!.. and will get more "original" red ones, and some of the petrucci signature (black ones) when I need new ones..
and will get the purple Paul Gilbert Ibanez + the Steve Vai Ibanez Signature, and the Satriani D'addario/Planet Waves Signature... to test them out.. as I have never tried them.
If you can't play good with one of those.. then it must be your playing is bad!.. not the pick! ;)
Happy shredding y'all!