There 2017 should still have 15.000 km garanti the other one no, both looks good condition , repair dont know to much , both free charge
"Should" have guaranty does not mean "does absolutely" have a guaranty.
EDIT - I noticed you said you are limiting yourself to choosing from 2 cars. There are thousands of vehicles to chose from in Europe, so don't limit yourself to just 2.
Buying a car means being prepared. You're buying a car without being prepared. Sounds like you're buying from a private seller and not Tesla, and that is potentially dangerous, as there are not guaranties or enforceable warranties.
If you buy a Tesla and don't know what you're getting you will be screwed.
You sound like you don't know much about Tesla vehicles, and that suggests that you should not buy one, in my humble opinion.
You need to do your homework and know what you are buying before you buy.
Signature series means nothing to me. It is just an advertising gimmick. A robust car that will last a decade is more important.
Did you bring either vehicle to a Tesla dealership to have it checked for issues? Did you get the repair logs from Telsa? Did you make sure the batteries are not damaged and are within factory specifications? Does this car have air or coil spring suspension? Ventilated seats? Heated seats? Rear electric seats that were prone to not working? Those years had issues with those devices IIRC.
Don't buy an expensive luxury car unless you know what you're getting.
I would suggest a Model Y that is brand new for you. More affordable. Full warranty. Will last for years and years. You will know what you're getting. You can get the options you want.