I have the US backpack in lambskin & love it! I’ve had mine since 2016.
I pre-ordered the Montsouris empreinte when it first came out but returned it on the day it was delivered. I didn’t like the leather and how the bag holds up. The US has more structure somehow. I am now waiting for the BA backpack in a colour I like. Good luck deciding!
The Urban Spirit backpack will slouch a little and the top flap will crease from the using the top strap but that is what kind of bag it is. It is not a structured bag. I have had mine for years now and it is my most used bag and it still looks great.
I have a 2 LV backpacks and they are both like brand new. I also have Chanel Affinity backpack in black and that is hands down my favorite. I have for over 2 years and it’s amazing and I get a ton of compliments. Based on the sole fact of lambskin on the US I vote for the LV due to durabilit.
I love my urban spirit and it’s super durable. I’ve worn it to disney and never got a scratch on it. It’s also super classic. Both are beautiful but mine has really been a staple and I’ve reached a ton for it