I apologise if I offended anyone, I did not mean to throw stones. I don't profess to be an expert in this field, just a somewhat seasoned amateur.
Both the Rigol 1054z and the Siglent 1104x-e are more than capable scopes for a beginner -
you can't go wrong with either. For my money, I went the Siglent and I'm happy with it. At the risk of starting a religious war, I also went a 121GW meter vs some of the Brymen meters, cause I like supporting the community and I like the features it has, I especially like the small size.
The Siglent is higher rated in its default configuration than the Rigol (100mhz vs 50mhz, higher sample rate too).
Both can be unlocked to allow higher bandwidth (100mhz on the Rigol, 200mhz on the Siglent)
The Rigol is slightly less expensive.
Subjectively - people have said the UI on the Siglent is better than the Rigol - I don't know, I haven't compared them side by side. I don't find the 1104x-e particularly difficult to use, and the lcd is easy to read.
From personal experience, the Siglent WiFi is very finicky but the built in web interface is simple and works pretty well. People have complained about the lack of web interface on the Rigol - but mentioned that 3rd party software can make up for this.
The 1104x-e can have a Waveform generator and/or a logic analyzer added to it, the Rigol cannot - however these are somewhat expensive addons. ~$200USD for the Logic Analyser vs $60 for a half decent one on ebay, the benefit however is that these can be aligned on the scope with your analog waveforms, and you get siglent connector probes.. I haven't decided if this is worth it yet.
There is 1:1 comparison of features here, in this first post:
https://www.eevblog.com/forum/testgear/siglent-sds1204x-e-released-for-domestic-markets-in-china/There are many many threads on this topic:
https://www.eevblog.com/forum/testgear/siglent-sds1104x-e-vs-rigol-ds1054z-advicehttps://www.eevblog.com/forum/testgear/siglent-sds1204x-e-vs-rigol-ds1054z/etc...
Ultimately, to me, the question is one of price. IF you can afford the Siglent, it has more for you to grow into. IF you can't afford the Siglent, but can afford the Rigol, it will also help you learn a heck of a lot and do it well.
Whatever you ultimately decide, you can't really go wrong with either.