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Oag
The answer depends on the telescope.
I see from your signature you have Newt reflectors, both the Meade and Celestron OAG are obviously designed for SCT applications, to use either you'd need something like the Orion PF adaptor which would then allow a 2" connection. Having used both, my personal preference would be the Celestron Radial guider, gives easier star location.
The issue with Newtonians is getting enough back focal length to insert the body of the OAG, you need to check out the available space.
The Lumicon units are 100%. I originally used the short body Newt version on the 18" f4.5, with the built in flattner/ coma corrector. After many years I've finally gone for the Giant Easy Guider which I now use on the LX200. Easy to use, easy to set up and does its job. ( Also comes with a 80mm x 0.6 focal reducer!)
BTW I use an old ST-4 on the OAG.
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