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WOW, difficult question. I have a Vixen VC200L and can only speak of my experience.
The scope is a very well made and optically stable instrument made mainly for imaging. It has a built in field correction lens which produces almost perfectly flat fields. It doesn't have a front mounted corrector plate to frost over although I have had a couple of frost ups on the secondary mirror but this was easily fixed with a dew shield. The scope does suffer from large difraction spikes from the overly thick spider but good collimation helps this small problem. The focuser is not the greatest focuser and at the moment there is no alternative available although I believe one is being made at the moment. The mirror is fixed so no mirror flop problems.
Overall this is a great little imaging instrument which performs very well with medium sized CCD's or DSLR's for imaging and it also has a dedicated reducer which drops the FL from 1800mm to 1260mm at F6.4 with the same flat field.
I would still consider this an excelent imaging scope but would also be looking at the 10" GSO or 8" GSO RC's as an alternative particularly after the results Paul Haese has had with his. Then again he has replaced his focuser and it doesn't have a dedicated FFlattener as yet and appears to require some form of field corrector. I think Paul uses a Tak TSAor TOA field flattener to correct the field rotation.
Again a hard question and really a matter for personal choice. Check out some images from them all and see what you would be happy with.
This scope has served me very well.
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