IMO, I bet Bekele's popularity is much bigger in Europe where he spent a majority of his career making his name.
He has only raced in the US 4 times, Boston Indoors (lost to Cragg), Milrose (lost to Lagat), and two Pre 10ks. Maybe he has some additional performances in the US, but that's all I can recall.
Paris has hosted a Diamond League yearly plus the WCs where Bekele ran 12:56 for a 2nd 5k of a 10k. He has history here and so I think Paris is a better choice.