A "mini-lathe" or "mini-mill" are rightly regarded by the professional as toys compared to the 250K 8,000 lb. behemoth - but those "toys" may be the far better choice for the hobby user, and the hobby user might actually be producing superior work - in terms of precision, or in terms of beauty, or so on - because that is what the hobby user is focused on, without being constrained by the demands of the clock.
I disagree with this analogy. Professionals look for quality, size is not relevant in that way.
from what i observed, not everytime. pro usually look for time saving, quality maybe "okayish" or "acceptable", but anyone who look for quality will need more time. this what imho make apart name like Porche or Lamborghini with like Ford or Tesla.
I am genuinely struggling between the options. If I had more experience, I would have a better idea of which things I might regret the most if I went with this one vs.
to make it simple, from demonstration made here, if you want a better scope (only looking at, analyzing and debugging signal traces) sds800x will be better. but if you think you want to expand your scope into basic MSO mixed signal and AFG with bode plot (and LA probe ready) at cheap cost (people are working on it. not so easy with siglent), and can accept the fact that you need to probe frequency at lesser or equal to Sr / 2.5 at any configuration, then its dho804. at full channel on and MSO, 156.25MSps meaning to probe 62.5MHz signal. without LA turned on, 312.5MSps ie 125MHz and so on... with sds800x, all 4 channels on, 500MSps ie 200MHz, but if you want to add LA, prepare to pay another half or more the scope's price... want to add bode plot? another half or more the scope's price. we are looking at 2-3X the scope's price if we need full MSO+AFG capability...
during ds1054z age, the choice is easy, even though not easily hackable to full MSO+AFG, but siglent's cheapest price is still 2-3X the rigol's price, so its quite no brainer, but now, its quite challenging not just for you. a piece of advice, please stick to your topic, dont think about getting used ds1054z because its not 12bit, so we have to be clear about it. and you'll risk non 100% functional used scope or short lived one only for saving like $100 or so? you can end up spending more money in the end... cheers.