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Hi John
I'd suggest the f4
It's shorter, has a 3 " inch focuser which is required to avoid vignetting, as they claim it's for ap, it could have a larger than standard secondary which is also required, it's faster than an f5, so your exposures are quicker, wider field, should have enough back focus for your ccd or dslr.
With the skywatcher, you'll have the check the size of the secy, whether a dslr or ccd will come into focus without moving the primary up, (if you move the primary, the secy will need to be larger), check if the 2" focuser will cause vignetting. It's also longer, although the eq6 should handle it, it'll be more affected by wind, and you have to consider the weight of a guide scope and guide camera unless you go for an oag which I'd recommend
Also, don't get the bintel coma correctors, get the baader mpcc, they work far better.
The 3" focuser does need some tweaking to make it stiff.
Yes, collimating an f4 is a bit more demanding but not much, the cats eye tools will get your collimation sorted as they're very precise.
There are trade offs with both, but I'd go with the f4 mainly because it looks like you can start imaging out of the box with a coma corrector and guides cope of course and it's lighter and faster, whereas the sw might need some adjustments. Better to ask them.
ap is pretty demanding and there are a few things you need to get right, so I'd suggest reading thru some of the beginner ap threads here to make sure you have al the other components sorted, understood
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