I don't own these particular frames, but I do have a Lightcarbon gravel and a VB-268. Contrary to what some might believe, the VB frame is of noticeably higher quality in every aspect. However, I wouldn't recommend building it with a mechanical groupset, especially if you're using an integrated cockpit. It's possible, but it can be a major hassle. You'll likely end up with less precise shifting and other issues like tight or unbalanced steering.