I'm starting with the assumption that #1 on that list is "what's the best chain lube" so we'll start with #2. My guesses would include:
-- How many rear gears do I need?
-- Drop bars or flat bars?
-- 1x, double, or triple crank?
-- Sunscreen or SPF clothing?
-- Best place to ride a bike?
-- Take the lane or stay on a bike path?
Feel free to add your favorite bike-related thing to argue about.

And then, for bonus points, consider the following:
What do respondents to this topic need to know about the questioner's circumstances to have a reasonable discussion, rather than polling who can shout the loudest and / or longest?
Are there any arguments against your favorite answer that have some merit?
And for double bonus points, why do you care what other people think about this/these topic(s)? (with apologies to Richard Feynman)