Picking guitar picks can be hard this should help
Step 1: Different Thickness
All picks are different thicknesses. I like 1.5 and H, although you should try different thicknesses to see what YOU like.
Step 2: Texture
Different picks have different texture. For example I have some "max grip" picks which have a rugged texture. I also have gator picks, and I love the texture.
Step 3: Preference
Overall, you should use the pick that you feel is the most comfortable pick. I use many different thicknesses, and I like all of them. Just try out a bunch of different picks until you find your favorite one
All these pics were taken by me