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I can't comment on those two but I have been using my Evostar 72mm as a guidescope (Using the 0.85 reducer for about F5 at 350mm) and it provides heaps of guidestars. I started out imaging with that scope as an exercise in dipping my toe in the water and it is acting as a guider on my new scope until the new off axis guider I have coming arrives. I needed an upgrade there as the OAG I was using before lacked rigidity.
It does perfectly well and aside from the usual caveats about flexure between the guide and imaging scopes I don't expect any benefit from the OAG except for better integration of equipment and a lighter imaging rig. I would think within the same limits both the Orion 60 and Evostar 50 should do pretty well so long as the focal length suits what you are trying to guide with it. At 550mm I would reckon it should be able to work well.
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