In the last 6 years, I had to equip 3 kitchens with appliances and therefore dealt with the subject extensively. I paid little attention to dishwashers; what was important to me here was that they have a separate cutlery drawer (which was long reserved for Miele), that they have a quick wash program, and that they consume little water. However, I cannot say how comparable the consumption levels are.
Regarding cooktops, what would be important to me:
1.) Simple, intuitive operation. If I need the manual every time, that thing is useless. Personally, I like Neff’s Twisted Pad, but that’s a matter of taste.
2.) If possible, sufficiently wide (preferably 80 or 90 rather than 60)
3.) At least 2 zones with enough power. Entry-level models usually have only one zone with 2.5KW and the others significantly less.
4.) Zone sizes: Pot detection can also be a disadvantage because my cooktop does not heat if the pot is too small or too large. So make sure the cooktop fits the pots/pans you use.
5.) Scratching should not be an issue with current devices. They use the same glass as ceramic hob surfaces and they don’t get as hot. Nothing is as easy to maintain as an induction cooktop.
The oven:
1.) Avoid unnecessary gimmicks! A core temperature or humidity sensor is not bad, but only if you really use it. The same goes for all remote control functions.
2.) Pyrolysis is not everyone’s cup of tea, but those who don’t like cleaning their oven should consider it. However: expensive feature + power guzzler.
3.) The most important programs should be available (convection, top/bottom heat, grill, and if possible also in all combinations (e.g., convection + bottom heat for pizzas)).
4.) Single pull-outs are not just nice but, in my opinion, essential. Especially when the oven is installed at a higher level.
5.) Neff offers retractable doors. This is a significant relief for shorter people, especially with ovens installed at height.
Refrigerators:
From my point of view, this is where the biggest differences are. You usually don’t notice much of the above with the other appliances, as the devices don’t differ that much. With refrigerators, there are greater differences and more options. So far, I have been rather disappointed by Gorenje and Samsung (processing and noise level). I find the price/performance ratio best with AEG/Bosch/Neff. The quality is very solid, there are virtually all conceivable features, and they are visually and tactilely good to very good. Liebherr is surely a bit better (especially in terms of feel), but usually also 30-40% more expensive. You have to decide for yourself. Miele buys from Liebherr, so the price premium compared to Liebherr is not worth it. Sometimes they are offered at price parity. It is important here whether you want an integrated freezer compartment or not. If you still have an additional freezer, you should avoid a freezer compartment in the fridge. It not only costs space but also consumes significantly more electricity. I, on the other hand, would never do without a 0-degree zone again. It offers real added value because food stays fresh longer. However, this costs space in the refrigerator, so you usually have to buy a size larger compared to a conventional fridge. When it comes to energy efficiency, you should look carefully as well. For refrigerators, A+++ usually pays off; for freezers, the amortization time from A++ to A+++ is often 20 years or more.