This is a small real world comparison, measuring some switching noise on a buck dc-dc converter between a TinySA Plus spectrum analyzer, a Siglent Analog Discovery 3, 14 bit oscilloscope, a Siglent SDS2504X Plus, 8 bit oscilloscope and the Rigol MHO98 12 bit oscilloscope.
The measurement is not scientific in any way. Just me trying out measurement equipment seeing what can be used to look for switching noise.