Sorry this vid is so long. If you're looking for 2 min of high speed drifting, keep browsing :)
I wanted lots of detail regarding the kind of snow performance "that I'm curious about" and it took time.
And if you're shopping for AWD vans... you might like it too!

Next, it's way better to watch this on a big computer than a little smart ph. My Pacifica has dark wheels and it was a dark, cloudy, snowy day - therefore it's very tough to see subtle wheel spin & slip. But that's the detail I wanted to see for this comparison - so watching on a computer is the BEST way.

I used these two vans because I own them. It would've been great to have a Toyota Sienna AWD with us, they're very popular.

This is a test of the van's AWD systems on slippery snowy roads and hills. I'm not going extreme off-roading or rock crawling, you generally need real 4WD for that. These AWD systems are very helpful even if you have all season tires, which is what I'm using. If I was using real snow tires, I'd have even better snow performance including steering and braking, which is important for safety!
Anyway "my goal here" is to challenge the AWD vans capability for getting up snowy hills, so I'm making it tougher by using factory OE tires. And I am VERY careful with steering and braking, I understand the limitations.

Tires on the new (1500 miles) "2020 Pacifica AWD Launch Edition" are OE Michelin Premier A/S all-season "mud & snow rated" with 1500 miles on them.
OE size 235/60R18 103H - Treadwear 640 Traction A Temperature A.

Tires on the old (over 219,000 miles) "2004 AWD Grand Caravan SXT" are old, well worn Bridgestone Ecopia EP422 Plus all-season "mud & snow rated" with approx 40,000 miles on them.
OE size 215/65R16 98T - Treadwear 640 Traction A Temperature B.

How did this comparison end up?
Well (before the test) I expected the new Pacifica (3.6L V-6) would be much better than the old Caravan (3.8L V-6). And of course I wanted it to do better! After-all I just bought it, and it's got a brand new hi-tech AWD system, and it has better tires!
Whereas my 16 year old Grand Caravan is quite worn out with 219,000 miles, and has almost bald tires!

Testing details and my impressions -
Test #1 (moderate hill climb with slalom turns) they both did well.
And in Test #3 (maneuvering in a flat parking lot with fun sliding and little drifting) they both did well again.
In these casual tests, I couldn't tell much difference between the two - they both seemed fairly equal.
Test #2 however, is the tough one (repeated stop n starts in very slippery conditions on hill with a shallow slope) and there was an obvious difference!
The Grand Caravan did better (even with poor tires) I was very surprised !!!
The Pacifica completed Test #2 but there was more drama - sliding backwards, and sideways when trying to start - sliding downhill with locked stopped wheels - and I had to back up several times, trying to find a spot with enough traction to get started.

However with the Grand Caravan (and it's bald tires) there was no drama - very little wheel slip, unless I tried to gas it - no slipping downhill with locked stopped wheels. I drove them both the same, actually had to be much more careful with the Pac to get going, but the Caravan I just pushed the gas pedal.
I did just one run each, filming the driver's and passenger's side, for the GC, and Test #2 was done!
But for the Pac, it took much longer, making a few runs on each side, to finally get some success. (I only put the best runs in the video.)

This REALLY surprised me!
WHY did the 16 year old, well worn AWD Caravan with worn out tires... do so much better than the new AWD Pacifica with brand new tires in Test #2 ??

I've come up with two possibilities -
The Caravan is lighter!
And it has a higher 1st gear!
*Re: transmissions - the Pacifica has a 9 speed auto and 1st gear is really low. This makes it tough to start in snow without tire spin. The transmission in the GC is great, I think its a 5 or 6 speed (?) and acceleration is fine. But the GC 1st gear isn't as low as the Pac 1st gear, so it doesn't spin tires as easy in the snow.
*Re: weight - I weighed both rigs with 1/2 tank of gas at the state hwy truck scales, and my GC is about 700 lbs less than my Pac. So I think that makes it easier to get going up a slippery hill (all else being equal).
Of course once you are moving, things equalize. But getting all that mass going in the Pac, takes a lot of traction!
And due to the same physics (maybe?) the Pac when stopped (parked) on the very slippery, shallow hill, slipped backwards repeatedly (with quite decent tires). Whereas the lighter GC when stopped (parked) on the same hill (with very worn tires) was NOT sliding backwards.

I think this is all very interesting!
If these physics are right, imagine how much more traction an AWD Suburban would need to get started from a stop on a slippery hill, compared to a relatively light AWD like a Subaru.