Pencil float vs oval shape, which to use?

[The Rooster]

I went to Academy Sports tonight and selected a few to get me started. The pink and chartreuse Crappie Corks are both spring loaded and slip bobber, and have markings on them for suggested jig weight. Kind of a one float does all deal. Hopefully in these floats I will find some that work well for me and I will go from there.