It doesn't matter.
All that matters
is which will be the most high-paying one
And that depends on your own skills, interests, and countless other parameters none of which you've mentioned at all.
an objective "most lucrative niche". The fact that you might imagine there
concerns me, so much so that it made me hesitate before trying to answer your question at all. I can't help wondering what your concept is of "most lucrative", and "niche".
One thing's for sure: the niches with the most money in them
usually the ones in which any specific, individual marketer is
to make money.
There are reasons for that, too - and they're good and valid and reliable reasons.
Some of them are explained here (and in the four other links inside this post):
(PS: "blogging" isn't
, a paid activity
. It's a monetizable activity, but that's another matter altogether.)