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The Vixen - plain and simple much higher quality if you want to do careful astrophotography.
You can control starbook using free ASCOM drivers from software like Cartes du Ciel (Charts of the sky), I do almost all of my pointing of my Celestron with that bit of software - not the Celestron CG5 hand controller.
You can guide many scopes but every correction costs you something - its a bump you have to correct for. That bump will still be evident in your image. So a long shot with 200 corrections should not expect to look as good as a shot with 20 corrections. Also its important to get your backlash tuned well, so you don't over correct and start a rocking on your guide corrections. Finally the better your celestial South pole alignment the few corrections you will have.
For a permament observatory - or long runs of high calibre astronomy - PEC makes sense. Its annoying that the Vixen doesn't remember its PEC settings - but there is hope a firmware upgrade could fix that soon accoprding to american sites (Cloudynights). But PEC is all about minimising non random error in your gears. Random + non random errors = tracking capability. Higher quality mounts have better tracking.
So either you go for heavy load - and use it anyway you wish, or you lower the load slightly and get better motors and gears and go for better tracking and goto. Quality costs - so what are your priorities - load allowance or pointing and tracking?
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