I'm in the market for a endurance road bike and have hit a bunch of the local area bike shops to check out their various brands/inventory.

2 of the many bike shops I've visited asked if I'd like for them to do a quick fitting to see what size I seemed to be for the specific bike at each shop that I was most-interested in. I said sure.

One bike shop out of my local area basically watched me ride around a bit in front of their shop, took a few still pics. of me while riding past them, holding onto the hoods, supposedly put that photo through an analysis program they use to assess the fit aspects, and stated I'd need a 60cm for this bike.

Another bike shop located in my city put me up on a trainer bike in the shop, looked at my arm/leg/back angles as I pedaled and they made several general adjustments to seat height while getting everything as they felt it should be. They did some stack/reach measurements on this similarly-equipped trainer bike after all adjustments were made, looked at the geometry of this same brand/model bike that I was getting a fit assessment for at the other store a week or so earlier, and they said without a doubt I'd need a 58cm for the same bike.

So, here ensues the confusion with 2 highly reputable bicycle shops using 2 different means of performing a general fit assessment for the same exact bike, and both stating confidently that I'd need 2 different sizes as my ideal fit for the same bike.

I'm 6'1" and for the bike sizing charts for this particular brand/model road bike, it states that the upper end of the 58cm frame should fit for up to 6'1", and the 60cm model should fit from 6'1" on the shorter end up to a larger height of individual. So I do see that I'm right on the fence as far as my height apparently splitting me in-between the 58cm and 60cm frame size. Seems like I've read that if your height puts you in-between sizes, you generally want to choose the smaller frame as you can most always adjust either/all the seat post or the stem length to "make the bike bigger", whereas it's not as easy to take a bigger frame and try to coerce that bike into being smaller by stem length shortening/etc.

Any thoughts on how to determine what size is likely best for me with 2 different, long-standing, highly-reputable bike shops doing a general fitting for me for this exact same bike and both coming up with 2 different recommendations as far as the right fit of frame for me?

Thanks for your input!