Maybe it depends on our wrist shape. For me, between 15 and 16, I see a relatively huge difference. 16 sits on my hand (passes the wrist bone when my hand is down), but 15 doesn’t. It just sits above the wrist bone (again, when my hand is down) just like your photo of 16.
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I’m on the unpopular team snug-fit and I chose 15. Because I do not prefer the bracelet resting on my hand. With 15, I hardly feel it on me. I also have a 16 (sm love) and I do feel it. At times I have to like lift up my hand and wriggle the sm love so that it gets out of the way of my hand, if you get what I mean.
And another reason why I feel comfy with 15 is because the slimmest part of my arm is long (not long-long but long enough for the movement of the Love). Some people’s wrist may taper quickly so this may be a part that contribute to comfort (or not). And this is also to be considered when the plan is to stack 2 or 3 bracelets in future; meaning you can’t start too snug or else the rest of the bracelets are gonna feel too tight as the stack heads towards the elbow direction.
Not sure if I’m saying this clearly …