It depends on where I am fishing. If the water is "dangerous" I use a large Stohlquist Fisherman which is very bulky, but very safe.
If I am in protected water I use an old vest type PFD that I have had for a long while.
I fish a lot of small waters, ponds and watersheds mostly and the smaller makes me feel fine.
I am seriously considering a SOSPenders.
There is a local Canoe & Kayak group in this area and it amazes me how many of them run the rivers (no white water) with no PFD.