I found my Arkose not overly comfy and a bit sluggish, even with lighter wheels than standard. Looked nice in matt blue but to ride it was solid and safe rather than inspiring.
Now I’ve got a Giant TCX which is still a bit heavy compared to a dedicated road bike but it seems a bit more lively. However, having cross geometry, there is more toe overlap than there was with the Arkose. Depends if you’d find that annoying.
EDIT – Why have people started talking about Arkoses when you’ve asked between a Boardman and a Cannondale?? 🙄
The Cannondale looks fun, but the 1×11 gearing might be limiting on the road and I also don’t know how the 650B wheels would fair. Boardman would probably be the more versatile and less limiting when you’re on a road ride – but still good for CX.