Out of the two I would go with the 717/XT combination hand built by Merlin. The will be easier to service and maintain over the long term – although many people on here have no time for XT hubs.
As njee20 says neither will be light wheelsets – but you get what you pay for so to speak and it sounds as if you have a budget or price in mind.
Pedalon.co.uk and Evans were selling 2008 Bontrager Race (£125) and Race Lite (£170) wheels pretty cheap a couple of weeks ago. They are not exceptionally light wheels, but they have good DT Swiss hubs, Double Butted spokes, welded OSB rims and are Tubless compatible and can probably support a slightly wider range of tyre widths than 717 rims which may be relevant depending on what type of riding you do.