Setting aside bandwidth and price are there any reasons to prefer the Siglent SDS1204X-E over a 4 channel Rigol MSO5000?
In my opinion: No.
7" Display (800x480) vs. 9" (1024x600)
up to 100000 wfms/s vs 500000 (measured) (both in normal mode)
14 Mpts Memory vs 100Mpts (200Mpts opt)
1GSa/s vs 8GSa/s
Good math functions vs much more math functions, up to 4 functions viewable at the same time
1Ch AWG option with additional hardware needed vs 2Ch AWG option without additional hardware needed
Etc., etc. …..
Benefit of the siglent is the Eres function, the brighter display and included instead optional decoding functions.
I like the siglent, it´s worth it´s money for sure.
But better as the 5000...I don´t think so.
When rigol takes it serious on debugging all known issues plus adding some more (missing) features, it can´t be beaten in it´s priceclass and above.
I got the siglent 1104X-E, it´s a best choice for the money and surely, the 1204 will be it too (200Mhz !!!).
But all in all no competition to the MSO5000.
IMHO, that´s understand.