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2nd
I would go with the 2nd one. In fact, my all-road type gravel bike is very close to that one.
1st reason is head angle. 71.7 will play better off-road but will not be troublesome on the road.
2nd reason is front center. If you have decent sized feet, design 1 is likely to have toe overlap. Can come into play more often than on the road. Think uphill switchbacks. Not a deal breaker, but can be annoying.
My suggestion for Shimano is BSA. Lots of good BB's exist. Sounds like you are going for internal hose routing? My best suggestion for this is to have the builder use 2 holes in the stay, have the hose exit near the bb, pass externally under the bb shell and then back into the frame one the lower side of the downtube. In practice this is perfectly clean and you will never see it. DI2 wires will easily find their way around a BB. Fully internal with the hose passing through the BB shell is a pain. Less so with 30mm, but still a pain.
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