When I first started playing I went to the local guitar shop and bought a load of picks in a variety of shapes, sizes and colours as that's what my "Teach Yourself Bass" book told me to do 😄
The "standard" shape is the only one that felt good and I've stuck with them ever since.
I currently use these Hercos, they're a bit lighter than expected for use with a bass but I like a bit of give. A much more expressive sound for me.