Which frame size would you choose, I'm currently riding a Canyon Ultimate CF SL 8.0 from 2018 in size S, which actually fits quite well (my height is 174 cm with an inner leg length of 82.5 cm), the Canyon geometry table specifies the bike for a height of 172-178cm.
That would be almost identical to frame size 54, but I would lean towards 52...what do you think?
play with the website geometry bike geek. make sure you plug in the bikes side by side, make sure you do the work, then no risk of ordering the wrong size. Obviously, consider the size of the cockit / stem as well: usually a 10cm stem is more reliable than 8cm, when it comes to steering. 8cm can be twitchy, although small frames often come with 8cm stems.
If you happen to be running a baby stem because the frame's too big, then factor that in when you compare frames.
The recommended height in geometry tables are valid if and only if you're very normal. For example, i have long legs for my height, which means i've bought frames that we too big for me for years. So don't trust blindly that indication.
Stack and reach dont lie - assuming you're comparing similar bikes.