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As was already established, If you need only basic math, and lowest possible noise, DHO800 does best job for least money.
DHO4000 really has no additional features (capabilities) in addition to DHO800, except BW active probe interface and more decodes.
Fact is, people complained so much that previous generation Rigol scopes have lots of noise that Rigol took it seriously.
So seriously, in fact, that they seem to think other stuff is not so important anymore. ![Azn ^-^](https://www.eevblog.com/forum/Smileys/default/azn.gif.pagespeed.ce.7t5xC2ZH_H.gif)
You could add the sampling rate(1.25 vs 4 GSa/s), memory (25 vs 500 mpts), WFMS, display size, etc. but basically you have right. The same is for SDS 3000XHD vs SDS 800XHD ![Smiley :)](https://www.eevblog.com/forum/Smileys/default/xsmiley.gif.pagespeed.ic.R8GFI-pF6f.png)
Not exactly. SDS3000xHD has MSO and also Acquisition Gating, that allows you to have gated FFT for instance.
And more things to come as the platform matures. It is, like, 3 months since release.
But with Siglent your statement is a testament how powerful SDS800xHD is.
With Rigol it is more like how underwhelming DHO4000 is as to what i could (should?) be.....
OTOH, both Siglent XHD series and Rigol DHO series are a class above in capabilities compared to what Big brands (don't?) have in that price class.. Or in some cases at any price.
World have changed...