Too Loose or too tight.. Which one causes bracelet stretch?

[Ronin78]

I've heard both arguments. I would think that a tight bracelet would be more likely to stretch as its under near constant tension.

Some say a loose fitting bracelet is the culprit by allowing the weight of the watch the stretch the bracelet out over time.

Then there is argument three. Dirt gets into all the crevices an holes and grinds them out and makes them bigger, and thus out of round.

I will clean my bracelet in an Ultrasonic cleaner once a month and hedge my bets. I personally wear my watch rather loose. I can slide a finger between my bracelet and wrist. Which comes in handy in the Florida heat and humidity.

Opinions on this?