Lee, I have both, and have guided with both.
When I image with the DSI, I guide with the modded.
When I image with the Modded, I guide with the unmodded.
Yes there is a difference, but even with the unmodded I don't have any problems finding a guidestar, but I have very dark sky.
The modded does show a lot more to choose from. If you have the slightest bit of light pollution you will be better off modding it (plus you can image DSO's with it).
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