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I take most of my images at 300mm FL. I have a 90mm Mak with a FL of 1250mm as a guide scope. Even though my mount does not suffer from random 'jumps' due to gearboxen I have found that even at 300mm FL guiding is very important.
I can take a two minute image and the mount will not move by more than one pixel. This is enough to soften a stack of images though.
I use GuideMaster as it controls both the shutter of my 5DH and so it can move between exposures to dither the data collected.
There is no 'best' software as only you can work out what works for your setup.
It is up to you to control the variables to make it work best for you.
Take some time no matter what you use to adjust the settings. A tiny tweak can make the difference.
Bert
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