Hi,
New features like VESA mounting points, a HDMI output or UI gimmicks are not relevant to me. My fields of interest are esp. audio signals, Arduino programming, and general purpose electronics on an amateur level.
That would mean the MSO5000 is out.
In 2018 it was a sensation, with max 8GSa/s and two-channel awg.
But it has a noisy front end, which is rather unsuitable for fine audio signals and ripple measurements.
The FFT function is also rather rudimentary.
If Bodeplot is interesting (keyword LF filter, frequency response of amplifiers), I would not use rigol.
Although the 12-bit DHO series has excellent low-noise performance, it is equipped with a rudimentary FFT like the MSO5000 and the bodeplot function (DHO900) is virtually useless as things stand.
I would therefore have a look at siglent.
If 12Bit is not important, the SDS2000Xplus, if it is, but the screen does not necessarily have to be 10”, then the SDS800X HD.
Both have a very good FFT function and low-noise front end, and the bodeplot function is also very good for an oscilloscope.
If low noise is the only criterion, the DHO800/1000 would be suitable.
I would do without a DHO900.