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Depends on the size of the sensor.
A full frame sensor will need the flattener. An APSc sensor probably also but these smaller sensors like the ASI533 may not.
Quad TCC gives F4.5 and a wider field of view with excellent correction. Its very sensitive to spacing. The flattener is more forgiving.
I have and use both. My 130GT is essentially the same performance as the GTX per Roland. The GTX has a bit wider colour correction but mainly it was to
make all lenses spherical and easier to make as opposed to the GT which has an aspherical lens element.
Greg.
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