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I started off with an OAG (Orion Deluxe), then got a TS 27mm OAG, then went to a guidescope when I dropped back to 900mm focal length ~1"/px.
I've just recently gone back to an OAG (Celestron) and I can see an improvement already in terms of flex.
I'd recommend an OAG regardless of focal length, and I'd recommend the Celestron; it's better than the other two I mentioned by a huge margin. You can rotate it 360 degrees and it comes with a helical focuser, which are massive improvements on the other two.
The Celestron does need chew up a bit of backfocus though, so it may not be suitable in all circumstances.
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