Iāve been using both Tortex Flow and Ultex Flow picks in 1.0mm for a while now - I tried the original Flows, liked them, always liked Tortex so when they introduced those I figured Iād switch over, and then in the last few weeks have been going back and forth and honestly think I prefer the original Ultex ones - they have rounded edges whereas the Tortex are a little more squared off, and thereās some texturing on the face of the pick I like. They also wear better - itās a tossup when theyāre brand new but I like the tone of hte Ultex ones after the Tortex starts to get worn.
The thicker ones definitely chirp a bit - I first tried the Petrucci picks, which are 3.0mm I think - but the thinner ones donāt seem particularly prone to it, and Iād rather a pick with a little more give to it than the Petrucciās anyway. Though, they look awesome, so thereās that.