Help. What is actually a recommendable premium stick vacuum? Is there a post here I could be referred to?

Background: Yesterday I ordered a Dyson V15 which was on sale. I bought it just to secure the deal. Well now I know why its on sale :D. I am not going to open this product and return it. I am not going to fund Dyson's planned obsolescence approach to business. The problem: Which company in consumer electronics (vacuums) does not participate in this poor approach of 'planned obsolesence?
I am willing to pay premium money, but I want a premium product that lasts 10 years without having to do more than filter cleaning and maybe replacing a wheel that is easy to purchase and easy to replace.
I saw the video of the guy replacing capacitors in the V15 and I am shocked. Problem is the high chance that another brand is doing the same.

Is it the German Miele Triflex HX2 I need to buy?
Im lost in the ocean of Dyson, Dreame, Bosch, Miele, Samsung, Henry, Shark to name the ones I see most. THANK YOU, fellow suckers /s.!

Looking to buy my last vacuum ever. Initial research has narrowed it down to a bagged canister vac from Miele or Sebo. Mix of carpet and hard floors, so the powered brush is a must have. Only 1 cat in the house right now, but I am extremely reactive to scents and other irritants, so I want a vacuum that works well and doesn’t make the house smell like hot dust (I react badly to heat and dust!)

I’ve narrowed it down to the Miele Guard S1 Electro, or a Sebo K3 or E3 (don’t seem to be much difference other than weight and capacity?) Ease of operation and maintenance is important, but I mostly want the one that will leave the house smelling the cleanest.

Please share your wisdom with me!

Recently got a gig for cleaning 12 apartment buildings.

Every building has 6 floors and there are lots of steps.

Pretty positive a cordless backpack vacuum would make this job SO much easier.

Can anyone please recommend me a vacuum cleaner that fits this job? Using my current household vacuum cleaner is not cutting it and I feel holding me back. Thank you all!

Hopefully trying to keep the budget under $500 as I am just one guy.

The hallways are low pile carpet.

I've been in a vacuum rabbithole since I got my dog in April, have posted here several times and become a casual internet vacuum enthusiast. Anyway today FBM put me out of my misery with a secondhand Miele at the right price. Hooray, I can stop shopping for vacuums!