I didn't use a pick at all during my first 18 years of playing. For the last 6-7 years I use a pick 30-40% of the time.
I liked the Dunlop Max-Grip picks. I tried everything from 0.73-1.14, and settled on 1.0 and 1.14 depending on string tension.
Last Summer during a rehearsal I found a Dunlop Ultex Jazz III sitting on a shelf. There was still a bit of an adjustment period, but I liked it better than the standard pick size. I could play faster and a bit more accurately (fingers closer to strings), and I liked the tone better.
Plus, with the smaller size, it's easier to switch from pick playing to fingerstyle in the same song, holding the pick with my 4th and 5th digits.
The only bummer I found with the Ultex is that once you drop it, finding it is a lot of work due to the translucent phlegm color.
Most recently I switched to the red nylon Jazz III. Despite being listed as the same thickness (1.38) as the Ultex, something about the material makes it seem a bit more flexible. I like more flexibility with a stiffer or higher tension string.
The red nylon Jazz III is available as Max-Grip, which is helpful during sweaty gigs. I have a pack of these on the way right now, but I'm not sure if the Max-Grip will interfere, as I like to use the tip or round edges of the pick depending on the song.
MAX-GRIP JAZZ III NYLON GUITAR PICK
Also giving these a try:
PRIMETONE JAZZ III GUITAR PICK