If you want to stack up these 3 side by side, it's been done in a comparison table in the first post in this thread:
https://www.eevblog.com/forum/testgear/siglent-sds1204x-e-released-for-domestic-markets-in-china/
Check it out.
Come back with anything you have trouble getting to grips with.
Oh, sure, a chart made by Siglent fanboys using an unhacked Rigol and cherry picked data points. Basically a Siglent sales brochure.
eg. How come the waveform memory isn't in red for the Siglents? The Rigol definitely has more (24 vs 14).
Clue: Anything on there that says "option" in the Rigol column should be included and the green removed from the Siglent columns.
etc.
First. Of course if we compare things need use official versions, not "illegally" hacked.
Why memory is not red in Siglent.
Because if do this, then need do more colums in table.
Siglent have 2x 14Mpts max. Rigol 1x 24Mpoints if Option is active.
But then, again Siglent go to green if 3 or all 4 channels are in use. Then Rigol with option have 6M for each channel and Siglent 7M.
What are "cherry picked". Ok, you can do opposite cherry pick. I will recommend you to do it. Lets see after then how nice chart you get.
Do you really think I'm Siglent fanboy. This is so far away truth what ever can be. You are fall in love with Rigol and this make you extremely biased and blind. With my profession with electronics I can not be any single manufacturter fanboy, never. It was tens of years ago I have been small amount of Tektronix, Hewlett-Packard and Rohde&Schwarz "fanboy. Also I have been some years in history Rockwell Collins and Racal "fanboy".
Last two months in real life I have recommended when asked least LeCroy, Keysight, Tektronix, Rigol, Owon, R&S, Siglent, Fluke, Victor and some others.
With all my professional knowledge and tens of years professional (now retired) and also hobby experience with lot of T&M equipment and this is real work, not "salesman" at all. Now I some times sell some equipment mostly Siglent and this is perhaps <1% of things wjhat I do. It do not mean any single things for m,e if someone buy Siglent or what ever. But also I can tell that if we talk oscilloscope as serious tool. Siglent SDS1004X-E series is far over Riglol DS1000Z series. There is no much competition in performance. But also as I have many many times told, it is not even fair to compare so different equipments. Like compare "light car" and car. Yes both have 4 wheels... and both we name "car".
And then, Rigol come to markets far before these Siglent models and at this time if need cheap 4 channel entry levbel scope it really was amazing and together with hack it come really popular and with reasons. Even so amazing that one day I my self buy one for one project. Even today DS1054Z is good selection specially if do not need more performance and need 4 channels and budget is limited to its price today. Good hobby scope for many use. But then, bit more money and get lot of more performance.
But then if we start do more serious oscilloscope work... then there come these Siglent models strong features. As example fast sequence acquistion (up to 100M memory), always backround running history (up to 100M memory), 2 chanels 1GSa/s because it have 2 ADC when Rigol have one. Much better true sensitivity. True full sample memory resolution measurements. Right working fully and free selectable post processing Sin(x)/x (important with some kind of signals when Sinc is not optimal.
Lot of better FFT.
Bode plot what beats all scopes in its price class as 10-1 (as also history and fast sequence) If I start real cherry picking... oh well I do not want even start this debate
Of course if use example 1 cannel alon Rigol have 24M. THis is nearly double if compare Siglent.
Oh but I have many times heard that peoples need 4 channel scope...
If use 2 channel. With option active Rigol have 12 M for both channels. and 500MSa/s max. (without option, 6M)
Siglent have out from box if 2 channels in use 14M for both max and 1GSa/s for both max.
So is it more wise keep these main colums without full red or full green. Because in some use Siglent is out from box more than Rigol even with option and I have weighted in this thinking 4 channel use and not only available max alone in some use (1 channel use) And if you look, I have colored this Rigol light green (this case if option active). So, who and what is cherry picking.
Ok, lets think hack. Then Rigol 50MHz is 100MHz and Siglent 100MHz is 200MHz.
Then Siglent 500uV/div and Rigol 5mV/div if we look full vertical resolution.
How about Rigol salesmens 12 bit high resolution.
This is least partially lie. There is not any 12 bit resolution available. What ever mode use it is 8 biot and nothing more, after ADC and in acquisaition memory. There is no 12 bit. (very different if look example some Tektronix high resolution what also mean that there is higher resolution in memory... example 8bit normally and high res depending settings up to over 12 bit and it is in acquistiuon memory. They can tell high res mode have (example) 12 bit. (yes in some model memory width is doubled)
Still waiting 1GHz Siglent SDS5000X...