The Bisinc resampling is probably best but slower. For most cases a simple and fast bilinear should be good enough.
For cross-correlation based coregistration, you can view and export the RMS values through the InSAR Stack Toolview found in View -> Tool Window -> Radar -> InSAR Stack
For TOPS coregistration, we don’t have RMS values but you could look at other statistics such as for the ESD.
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