When someone is convinced that brand A is better than brand B, no logical argument will change their mind, because brands do not rely on logic, they rely on human emotional responses. Only a personal event, changing their emotional responses, will affect their conviction.
I guess this is partly aimed at me. Let me tell you: I have spend (directly and indirectly) about 4k euro to make Siglent equipment work in a business environment and failed. That is a hard learned lesson.
And that is why you feel so emotionally about this.
fanboyism
No, I was not talking about that; "fanboyism" is a completely separate phenomenon (and one based more on dopamine kicks than emotional responses).
I mean that you feel strongly about brands, because you have hard earned lessons about them; but you do not logically see how small your own experimental sample is, nor do you acknowledge any selection biases inherent in that sample.
You are not behaving logically here. Your admission that your opinion is based on your experiences, combined with your conviction, is proof of that. Experience ≝ anecdotal evidence ≠ logic.
And yet you are still wrong because you are trying to make an analysis based on incomplete data. If you actually knew which equipment I have and have owned precisely (which you can find on this forum) and how I select it (which you can also find on this forum) you'll see that my equipment selection is based on buying things that make sense financially. Maybe read some of my older posts and you'll see exactly how my way of thinking about buying test equipment has been shaped over the years. It is all here on this forum. IOW: do your homework first before jumping to any conclusions. If I was acting emotionally, I would not have re-tried to use Siglent gear again but based on the information on this forum, it looked strongly like a particular piece of gear would fit the bill so I recommended buying it to a customer. That turned out to be a mistake due to a deeply hidden flaw though.
To add another datapoint: I have a close family member that utterly hates Ford cars. So from the day I could understand spoken word, I was told Ford is crap. Fast forward to little less than 10 years ago: I needed another car so I sat down behind the computer with a piece of paper and a used car website to see what kind of models would fit the requirements and budget. I found a couple of car models including one from Ford. I researched all of them (looking at common problems reported by people that have driven their car for a long time) and it turned out the Ford model was the best buy so I got the Ford. Now tell me that this process isn't based on logic.
I follow the same exact same principle when selecting test equipment. From going through that selection process (which can be lengthy every now and then) for various bits of gear I've learned that buying an A-brand gives the best chance of getting a piece of equipment that just works (just like there are car brands that typically produce cars with less than average problems). The alternative is to buy a cheaper instrument which needs to be functionally verified thouroughly (which can take more time & effort than is financially sensible) and/or needs modifications (which again involves a time / money tradeoff).
Anyway, this is going wildly off-topic in this thread.