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aghh...the old OAG vs guidescope dilemma.
Well, I think that the real issue is how well everything is bolted onto your telescope.
If everything such as the guidescope (inc. it's focuser and guide scope rings), mirror cell, focuser, adaptors, etc are bolted together really well then a guide scope could work for you.
If any of these is not 100%, then OAG is the way to go.
Went through this journey a few years ago - admittedly with a 12.5" and 80mm guidescope - OAG finally did the trick.
Most people will suggest that under 1000mm FL imaging guidescope can work well. Above this, unless you have a super deluxe mount and scope, then OAG.
Also, if you have a very sensitive guider, and imaging from a dark sky, you will never have issues finding a guide star with an OAG.
Let us know how you go.
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