Both. A site I visit, gives a small snapshot of what's available at the different car agencies; Adventures On The Road (CarRentalGuy):
Source: YouTube https://share.google/LZvlQvdNTmhPfeM6u

he’s got a great channel. For the most part it seems like it’s everything that I’ve seen.

MIA AIRPORT
RECEIVED BMW X3 WITH 10 MILES
nice car for 2 weeks

YVR / Canada:
- Special Recreational Vehicle: Mix of Wrangler (not 4xe) and Bronco.
- Sporty Car: Mustang Ecoboost in various colors, including blue.
- Pickup Truck: new generation Tacoma and Tundra

No upgrade given but paid to be upgraded from a base to a m60 model, with a cracked window, noted the damage, just got the email from sixt claiming we damaged it….even though it was noted on pickup. Aside from that, great car, great experience

Have they changed the group codes? Or is there an IT problem going on?
XCAR (5 series) is now showing as UCAR on my account
And XFAR (X5) is showing as GFAR now…

At TUS in Nov 2025, they had a good variety of 7-seater SUVs:

• VW Atlas
• GMC Acadia
• GMC Yukon
• Toyota Highlander
• Hyundai Santa Fe

I have a reservation for July 2026 at the Sixt station in Boston Westin Seaport. Booked an X5 for 3 weeks for 655$ 😄

does anyone have experience with that station?

SEA ~0730 today was pretty stocked, but nothing exotic - One X5,one X6, didn't see any 5ers 7ers or X7s, no M package or AMG cars, one CLE, several X1/X3s, 2 or 3 Volvo wagons, Pacificas, I think a couple of Broncos, and some more typical non-highline rental cars.

My X5 or similar (now GFAR) reservation for this week netted me a 2025 GLE 350 4Matic ~12K miles, typical USDM rental spec (but these come fairly well equipped). In pretty good condition for those rental miles, all apparent damage noted but these days I look at LDW as a cost of doing business and have some peace of mind. It's fine especially for the price paid.

Sixt SEA 12/26 ~1600 - return lane had my GLE, 5er, some kind of GM CUV. In the rental area spotted X5, X6 with fancier looking wheels than the one on Monday, a couple X3 and X1, CLE, CLA, a handful of mainstream brands.

Vegas rental
 

looking at booking a rental from Las Vegas in Late February for 3 weeks. they have a FULLSIZE (FORD MUSTANG)
or similar | Coupe at a very good rate. anyone know what else might be in this category ? would love the Mustang but just worried what I might end up with

Six IAH 3/4 to 3/10 - booked GFAR and got a MB GLE with FL plates; also noticed an X5 in the lot and some other BMWs, but otherwise only standard stuff

Easy pickup and drop-off -- only hiccup was a missing carseat I ordered last minute (ca. 12 hours before pickup) -- had to go back to the attendant and ask

SIXT LAX- The Lincoln Nautilus is now an option when reserving a GFAR. They seem to be all in the base Premiere trim, but some of them have an upgraded option package to add on more luxury features. I also spotted a couple Ineos Grenadier alongside the Mercedes G-wagon.

Probably a Tahoe. Or a Suburban.

very rarely an X7.