Here is the kind of quality you can expect from Dell (and this is for a premium priced computer).
As long as your not picking out parts with your eyes closed its going to be better. Prebuilts just do not offer much in terms of quality (especially when it comes to bang for the buck) and none of these computers are using anything special hardware wise that would make them a benefit privacy or security wise versus what you can buy and build yourself with research.
If you really want to get a prebuilt tower maybe check out Starforge. The fact that its a bunch of creators with their reputations on the line backing it seems to keep the quality in line.
Laptops are kind of a different beast as you obviously can’t build your own. This thread may provide some insights.