"Modern" construction necks are remarkably stable. They're basically a "set it and forget it" neck. As such, I consider it to be a superior and more desirable design. "Vintage" and "Vintage Modern" are single truss rod parts, and so are subject to environmental changes that don't affect the "Modern" necks.
It's not obvious in the online ordering system, but any of them can be finished in any of the colors Warmoth offers. You just add a note to the order. If there's any adder because you're asking for "burst" or other more specialized finishes, they'll notify you. Or, you can call to place the order if you want an immediate number.