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From the comments here, the light pollution (or lack of) may also be a factor in how reliably the different guide camera options will work.
I have been using a QHY5 since I started imaging last year. First with an 80mm f6 guidescope, and now with a 500mm FL f8 camera lens (see attached). Both setups had the guidescope/lens rigidly fixed to the OTA. I have never had a problem finding a guidestar, although sometimes I would need to extend out the exposure time to 5secs. That said, I have very dark skies where image from.
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