100% agree on trying them on, that's the single most useful tool in your box. Like
@JwRosenthal said even dimensions are deceiving in photos due to design elements. You can debate it for weeks but know in an instant the moment you put it on your wrist, I know I've written off several formerly-favored pieces once I got them on my arm.
Generally I think it may be down to what style you're after. The Hamilton has a very authentic vintage feel, while the Speedy is a modern sports watch.
I don't think it's been said, but the reduced has a snap fit case back as opposed to screwed down. I personally prefer screw down on a modern sports or higher-end piece. I also think the Reduced bracelet feels cheaper at the clasp and flimsy in general, lightweight. I prefer them on a strap, so if you do try it on and don't like the bracelet, you could look for one that's sold as "head only" or on a strap and save the cost of the bracelet. Here's my old Reduced, long gone, just for giggles: