I've recently switched from metal to plastic finger picks. It gives a nice, fatter sound. Even more so with a Blue Chip thumb pick. I'm liking the white Dunlops best so far. Anyone else made the switch recently? Or maybe some have always played this way.
Personally I never liked metal fingerpicks on guitars, as I find the sound to be thin and harsh. I prefer plastic ones, because as you mentioned they bring a bigger, warmer sound. I don't like the feel of plastic ones, as they feel a bit bulky... but sound first in my opinion
Strangely, I much prefer metal fingerpicks when playing the banjo!