I refused to sell the cheap stuff and, here's the laugh, when people used to tell me they could get a "whatever" for "whatever price" from "whoever" (usually Comet or Currys) I'd quite brazenly tell them to go buy a machine there then if that's what they wanted.
It wasn't arrogance on my part it was just, I couldn't be bothered with getting into bartering nor was I ever prepared to lower my standards or the quality of goods I'd sell to meet the price points. Just my opinion and you can either respect it or not. But I can sleep easy at night.
I've no doubt that many people get on just fine with both as, if they didn't then they wouldn't still be in business so they must do something right. But, to me, they just pile 'em high, sell 'em cheap.
As for the original question and, this is only my personal opinion...
Most of the Zanussi machines I've seen of late I don't like but I don't know them well enough to make much more of that. That said, the feedback from the dealers that do sell/service them these days isn't exactly a glowing report. Shame, it was a good brand at one time, then the accountants stepped in.
Bosch, more and more are having the costs cut. Virtually nothing is actually "German" these days beyond the badge. It is starting to show.
Miele, good machine in general. Shame about the spares and labour pricing when they break. There are also some minor issues that I want to explore for myself that owners have been telling me about, especially with the honeycomb drum.
But all in all, probably the best you can do with what you've got these days.
Dryers, the White Knight/Crosslee things are noisy but other than that, as Don says, they're okay. Beyond that you're way up the scale. The cheap Bosch ones are a Gorenje in a dress.
Refrigeration, depends what you're looking at but for bog standard freestanding fridge freezers, avoid anything remotely with a whiff of Indesit about it, more so if it has electronics involved.
Bosch, not too bad.
AEG, save a packet, buy a Zanussi or Electrolux and get it cheaper with a different colour of trim. Use the saving to buy a warranty.
Miele, save money, go elsewhere and and buy the same unit with a Liebherr badge on it. No need for the warranty generally, anything that will break you'll have to pay for at any rate, like bottle shelves.
Cooking... you really don't wanna go there.
Depends on the requirements.