You're right...I tried to reach out to the Apple Stores local to me, and at least one of them which had reopened had closed again. I think the result is going to be as some have advised: assume a size, order the size (and band) I think I like, and return it if I'm wrong.
(As someone with CDO, I get uneasy doing it that way. I want to figure it all out and then purchase only when I've come to the definitive answer. What is CDO? It's the same as OCD, but the letters are in alphabetical order like they should be.)
(I was actually leaning towards the Sports Loop, but I do hear that it does wear out over time and that it doesn't dry out well in water. I've seen mixed reviews as well on the Leather Loop, that I love when I see it online but I have seen reviews that are less than stellar. But that's all for a different thread comparing bands, lol.)
The advice to look into the functionality of important complications feels like great advice, and I am looking into that as well. I'd hate for that to be the reason I go for the larger size if the smaller size feels better. But we'll see!