I don't know if I agree with either one of you on servicing issues.
Let's compare servicing the Stelvio (or Gulia) against my 2015 Cayman.
So, for the Cayman, I need 8 quarts of 0W-40 oil that meets the Porsche A40 oil spec.
There are a million oils that meet that specs, and one of the easiest to get is the Mobil 1 FS European Car Formula 0W-40 available at any Walmart, AutoZone, King Soopers, O'Reilly's, or anyplace else on the planet that sells engine oil. No need to even think about what oil to use than that one, as its available everywhere, and is cheap.
For the Alfa's, I need 6 quarts of API SP/GF-6A Certified SAE 0W-30, which meets the manufacturer Material Standard MS-13340.
Yeah, good luck finding that.
Or, they give you the option of using "equivalent" full synthetic 0W-30 API SP engine oil, but must have the API Donut Trademark.
Not too many of those running around right now, so Mobil 1 wins in that regards.
I'd rather use Pennzoil Platinum, too, but they haven't gotten their act together, yet.
So Porsche wins for oil.
Now lets look at the oil filters.
Just take a moment - Alfa wins that one, because you an buy the Mopar filter at any Walmart for under $12.
I have to order the Porsche Oil Filter from someplace, and its costs a bit more for an OEM Porsche, or a MANN filter.
So I have the filter, I have the oil, let's get the car off the ground in my garage, and get working.
Here, the Porsche wins, in my opinion.
I back the car onto the Rhino Ramps, and I have immediate access to both the drain plug, and oil filter housing.
Slide the pan under the car, a socket wrench, an extension, and the 8mm bit key, and I have the oil draining in about 5 minutes.
With the Alfa's, I have to mess around with that stupid under body tray for the next 10 minutes, to get access to the drain plug and the oil filter.
13 bolts and dirt in my eyes, and now I can do the deed.
So, cost wise, the Alfa oil change is cheaper for me, because less oil, cheaper oil filter, and easier to procure filter, but the Porsche doesn't require me to remove an undertray to get at the bits I need to service, and get sand in my eyes while doing it.
As for cost at a local dealer, I think my Alfa dealer charges more than the Porsche dealer does, so there's that.
It's that damn underbody tray, I tell you.
That's why they charge so much more.