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I don't personally like Kamala Harris but i see her having way more realistic changes then my favourite (Pete Buttigieg) so if i would bet for democrats, it would be Kamala. But looking from here it seems obvious that Ron DeSantis wins.
Pete Buttigieg has more chances in my opinion to win over the independent voters. Kamala may score better in deep-blue states such as California and New York, but in order to win the POTUS elections, you need the swing states (Pennsylvania, Arizona, Georgia, Wisconsin.etc). And I will tell you this: Kamala has almost zero chances of winning states such as Georgia. Buttigieg is more like a centrist, and he comes from a deep-red state (Indiana). But things may change, as two years remain for the next elections. Kamala is the most possible Democrat nominee, but you never know.