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Both have a 400mm focal length, though I would imagine the Esprit needs a reducer/corrector for photography? That will reduce it's focal length and increase the field of view.
At 400mm the both of them (Assuming the refractor does not need a reducer/corrector on top of that) should guide similarly, the advantage to the frac being the ability to use an off axis guider than you can't do with the RASA, that has to have a separate guidescope. The RASA might be a little more wind impacted when guiding due to the bigger surface area, the RASA WILL need a heater strap in cooler weather, the frac MIGHT.
I am still tempted by the RASA myself now that some quality images are appearing, I was not prepared to be an early adopter though.
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