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Definitely a newbie here and I'm going the OAG route (ST-i), with a DSLR. I can't compare to any other approach as this was my first attempt/choice. From my point of view, it definitely is fiddly and could do with some improvements on usability, particularly in focusing. I also found that connecting the guide camera to my OAG to be quite primitive - sliding on to the tube and screw lock down. I would have preferred a threaded approach with possibly a small separate focuser to refine the focus.
Another thing to consider is the field of view for the prism in the OAG - it can be an issue when trying to find guide stars.
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