It's really an individual judgment call.
Whatever you do, do NOT base your decision simply by comparing still screen shots. The three upscaling systems have qualitative temporal differences, things like occlusion, shimmering, etc. that really cannot be assessed by still images because they are time based observations.
Digital Foundry's comparison of DLSS and XeSS with Shadow of the Tomb Raider was careful to point out that still screen shots aren't the end all for these analyses. You must compare live action rendering footage to fully visualize the efficacy of each technology, both strengths and weaknesses.
Moreover, these upscaling technologies do not work equally well at all display resolutions.