I personally went with a custom built Titanium bike from Waltly - see the metal frames section. Slightly more expensive than carbon frames, but I was attracted to the ride quality, durability and strength of Titanium for touring and gravel.
So I ordered a bike with a gravel geometry, but with bosses for all racks and mounts. To finish it I have 35 degree flared bars and two sets of wheels (700C wheels with wider road tyres + 650B wheels with 50mm gravel tyres). By swapping wheels I basically have two very different bikes.
With the frame Waltly provided me their 'standard' option, which just happened to be very similar to another premium brand frame. With custom, you could take geometry from any bike webpage and provide it to Waltly to recreate. As part of the build you can also get personalise pattern or text on the frame by using shiny v matte finish... I forgot to take advantage of this.
For me getting a good frame was important, then I saved money by going Rival mechanical groupset... easy enough to upgrade the groupset later.
