Well... I'd like to see some hard numbers to back that statement. Several people have returned their Rigol MSO5000 due to bugs and missing of features. Siglent does seem to have a better handle on things and for audio the higher sensitivity is good to have.
Here, hands up...
Owned formerly a full optioned MSO5K I was disappointed on how they handle firmware update rate, also the noiselevel of the frontend was disappointing.
Then the siglent sds2k+ came along...
Bigger, brighter, better screen, better response of touchscreen, better UI, better performance in general (not overall), 50ohm inputs, autosense inputs, eres functions which works, comes with 200mpt memory without hacking, comes with several serial decodings without hacking, could be upgraded up to 500Mhz, more quality build and look in general and the first fw update got two new features...
Didn´t regret the change at any time, but both scopes got one thing in common:
For a beginner, there are more models wide under their prices avaible.