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I currently have a Skywatcher Star Adventurer Tracking mount. I am looking at options to improve my accurate exposure time. My first option is autoguiding. What is an effective autoguiding solution for the Star Adventurer? Or am I better off completely upgrading to a Celestron Advanced VX without an autoguiding solution?

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Celestron AVX without guiding for imaging?  Sorry, but you may be in for quite a disappointment... Very few mounts are accurate enough to image without guiding and they are in a totally different price range.

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Which lens / scope are you using ? the SWSA can easily cope with lenses up to 300mm or a small scope without guiding.

Dave

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