It seems like most of the comments are in favor of trimming first, but the poll results indicate a preference for mowing first.
Why are the mow-firsters such a silent majority? And what is the merit of mowing before trimming? I can think of none.
I've never even heard of trimming first, but now, after reading all of the virtues of trimming first, I shall explain why the silent majority.
We really don't care nearly as much as you trim-firsters. Our bu++holes don't clench up at the thought of 'unmulched' trimmings, nor at the prospect of clippings on our sidewalks. Heck, we don't even really care that much if it doesn't look as nice. Does it look decent? Good enough. With that mindset, trimming last makes the most sense. You mow, then finish what you didn't get with the trimmer. Feeling a little lazy on cutting your tight corners with the mower? Well, got a little more trimmin' to do. Feeling even lazier? Welp, guess I ain't trimming this week. You trim first...no matter what, you still gotta mow. You trim last, and you run out of time...skip it, brah.
So we have been silent because we're sitting here trying to figure out who the heck cares. Voting, that ain't hard. Typing why we trim last didn't seem worth the effort until it went this long.