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From my experience I found a little more focal length on your guide scope does improve your guiding marginally
I originally started with a 50mm guide scope with a 162mm focal length ( I use to swap my offset shoe mounted finder scope ) and guide camera ZWOASI120MM-S USB3 pixel size 3.75uM
And now I use a 60mm Orion Guide scope with helical focuser ( 240mm focal length ) central axis mounted on a solid bar off the tube rings with same guide camera. I’m consistently guiding around or just 1 arc sec total rms ( unless there wind or crappy atmospheric conditions)
I image with newts at 900mm and 1000mm focal lengths
So from my experience go with a little longer focal length and aperture
The 60mm guide scope has been a very popular guide scope across the globe and has been rebranded as Orion and other brands but effectively same scope
Cheers
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