I do like the Davas with the grips like in the pictures above. For YEARS I swore by Herco .50s (gold) for guitar and Herco .75s (silver) for bass, but while they have a nice grip and last forever, I've been gravitating towards thicker and thicker picks all the time it seems like.
I used to rarely play with a pick..maybe 20% of the time at most. Now I'm more like 50/50 picks-to-fingers, maybe leaning more to picks than that. I am digging it.
I have a pretty big assortment of different picks. I want to try those Wedgies but I'll have to order them online I guess. When I am practicing, I'll go through several different picks, trying out different ones. It's surprising to me how much impact different picks have on the overall sound of the bass. I mean, I expect there to be some, but changing up between some picks seems to really change the tone of things.
I have also found that while the pick widths I prefer are getting thicker (I like 2mm or above lately) I seem to also do better playing with smaller picks. My two faves lately are these (neither of which are as thick as 2mm, but I like the size and am looking for something small but thicker)...it's the small red Jazz III in this pic:
...and the small red Stubby in this pic:
I also use the larger purple 2mm Stubby...