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An important consideration not mentioned is that field flatteners require a specific back focus distance. If you go with the WO product you will know exactly what that distance is. If you go with a different brand there will likely need to be experimentation required to dial in the correct BF distance. That exercise can be tricky, expensive, frustrating and time consuming. I'd strongly advise you to go with the same brand unless you have a compelling reason not to....such as brand X has a longer BF so my equipment will fit okay, but will not fit with the WO solution. (e.g., you want to use an ONAG between the FF and camera).
Peter
edit: If you look at my equipment on my TEC140 I'm using an ONAG which is a beautiful setup. I was forced to use the TEC FRC with a BF of 115mm which just allows the ONAG to fit. The standard TEC FF has a BF of 85mm and therefore could never work with an ONAG. BF varies quite a lot between different brands/OTAs.
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