It is a matter of taste, not features. I had the DS1054Z, MSO5074, GW-Instek 1054, Siglent SDS1104X-E, Micsig TO1104, Micsig TO1102, EDUX1002G (modded to DSOX1102G), DSOX2004A, DSOX3004A, MSO3014T... I sold them all and currently I have the KS EDUX1054A (modding to DSOX1202G) and the Micsig TO1102. The micsig gives me portability, the Keysight an almost bug free and very responsive UI and amazing serial decoding. I was waiting for the Siglent SDS2104X plus but cancelled the order after careful evaluation that I don't need to spend $1400 to get a similar experience to SDS1104X-E.
If I ever need 4 channels, I can combine both scopes and use the trigger out on the micsig to trigger the KS and analyze 4 channels... if I need more, then I can add a logic analyzer to the equation (I work mostly with digital circuits).
For me, the scope itself is an experiment, so I came back to the EDUX1052A because I like to do the HW modding.
In my opinion, the vast majority of scope users do not use all the features. I recently encountered serious serial protocol trigger issues on the SDS1104X-E (when I reported the bug it was on UART, but the other day I was trying to trigger on SPI and it does not work neither) and it has been like that for the last 2-3 releases of the firmware, what makes me conclude that most people just use the scope for basic stuff, probably 99% on edge trigger and look for rise and fall events.
Conclusion: buy what you like the best with the money you can afford and don't ask for comments and opinion, unless you have a very specific use case and ask others for how a specific scope handles it.
If you are worried about customer service, then go for the KS as Keysight and Keysight_DanielBogdanoff will take care of you... good luck if you need anything from Rigol or Siglent (Well, tautech will help you, but it is a non-official limited assistance and cannot control what your local Siglent rep will do)