I really don't see what all this back and forth is about. Sort of like side loading vs top loading panniers. Both are good choices; it comes down to what works better for you and your style of riding.
I got a sidecar to travel with my dog. He never complains, is delighted to be with me, approves of my dietary choices, is a social butterfly who helps me meet folks, appreciates a good beer, snuggles better than my wife, and hangs on my every word as if it's the most profound thing he's ever heard. TravelsWithBarley.com