So you got the 38mm version to test it out and that's for your 8.5" wrist? The 42mm is only $50 more so get that and buy the XL sport band separately.
Ya, I have the Fitbit blaze currently. My first smartwatch. I loved the notifications on the wrist because my phone is always on vibrate, and I miss a lot. The heart rate tracking and all the other stuff is meh (my workouts are intense, so anything above 130 or so BMM is pretty much inaccurate...today it said I burned 1200 calories in an hour...riiiiiight).
I then went to the apple watch. I wanted to keep kit cheaper since a new one is rumored to come out in a couple months. But, the small watch face and small band make it unusable for me. I could probably live with the smaller watch face, I'll have to think about that.
But, I just confirmed with apple. If you want a larger wrist band, you have to buy the watch with the smaller band, then buy the larger band, and essentially throw the smaller one in the trash. What....a....waste.