Having owned all 3 rifles I would pick the X-Bolt but the Tikka would be at least as accurate. The Ruger would be the pick for a rugged rifle.
For me I wanted the accuracy of the X-Bolt/Tikka but the ruggedness of the Ruger. I wound up going with a new FN made Winchester 70 Extreme Weather. For me it combines the accuracy of the X-Bolt and Tikka but also has the ruggedness of the Ruger.