I'd opt for the XTZ660 despite it being heavier. The X-Country range have a small fuel capacity (10 or 12 litres?) whilst the Yam has 20+ litres (23?). Increasing the BMW's fuel capacity to match the Yam will cost good money.
Also think about service intervals & dealer availability? I know that the BMW needs an interim service at 6,000m and a full service with valve check at 12,000m - not sure about the XTZ? Both are 4-valve heads with shims for adjustment.
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