

Flip a coin or start both on Duolingo and see which one interests you more. This is only a hard decision in your head. If you’re not planning to move to somewhere where they speak either, this is just a hobby.
They are both romance languages so you’ll find mental handholds in either language that can help you with the other. Similar conjugations, spellings, irregularities, etc.
The French you’ll learn with internet resources or most text books will most likely be French French. As a learner, that will probably still make understanding the Quebecers an extremely hard task. It’s like somebody from a Louisiana bayou talking to a Scottish highlander. On paper, they are both able to speak English but there are accents and differences in vocabulary that increase the level of difficulty, even for native speakers.
Everybody draws their own vague red lines in the sand. There is no universal law. If you like it and it doesn’t feel icky, go ahead and like it. If it feels icky, don’t. Or make sure they get no money out of your enjoyment.