I haven't tried the Davas, but I've used a variety of picks for some time now. I like the Jazz IIIs, but I need the XLs - the regular ones are too small for my pudgy fingers. After I got those, I found the Ultex Sharps, and I've been using those a lot. I really like them. I have some Wegen bluegrass picks - thick, easy to hold. Then I added a variety of V-Picks, which I like a lot as well.
But then jfb ruined me. He sold me a used Red Bear pick.
Oh my, but it's sweet. I could feel a difference with how the pick slides off the strings from the get-go.
And just a couple weeks ago, I picked up two of their Guthrie Govan models. Roughly the same as the one jfb sold me, but it has a serrated edge along part of the rounded side.