The bottom for sure.
Ame has great advice. I know that several posters would prefer a more understated setting based on your manicure it appears that you love a lot of sparkle. The halo setting will definitely give you that.
ITA. I think your stone will stand out much more either as a solitaire (no halo) or with a very dainty halo. The halo in the second setting is a little too chunky and will swallow up your stone.