Where would you best buy a new laptop?
I would still look at Alternate and Amazon and order where it is cheapest.
https://www.arlt.com/reutlingen/
The computer dealer of my trust ("house and yard supplier" of my ex-boss)
Otherwise also an expert - a personal acquaintance of mine works in the computer department there.
But I would also have no hesitation in buying a special offer that I want to use for simple tasks at Geiz & Blöd or at the grocery discount store.
I do not attach such a purchase to a dealer, but buy where I see or get the best offer. In the end, I don't care whether I bought a product in an online shop, at the Blödimarkt or anywhere else. I also buy some items on site for convenience.
If I need something quickly and don't want to drive around the area, sometimes I don't care about the purchase price. Then I just pay two, three, five or 10 euro, but then maybe save myself the "mess around" with my car. But as I said, make it dependent on the respective product.
At the local dealer I trust.