The unlimited battery warranties of some Model S might sound attractive, but I don't think these are full warranty on everything. So for example, when the expensive door handles break on the Model S as they do? Be prepared to fork out heavy cash for that. It's a luxury-class car with luxury-class issues (read: many and expensive).
That said, the Model 3 is relatively new and untested as well. We don't know of an out-of-warranty major replacement yet. In-warranty battery replacements have been with the old pack returned ("core"), $12k and $15k (I think) plus labour, which is significant on the Model 3 as the battery was not designed for hot-swapping. Notably, the in-warranty replacements have mostly been good battery packs that met unfortunate demises, usually the under-protected coolant connector breaking. These returned packs thus have high value still, and a truly "dead" pack may incur heavier costs upon swapping than we've seen so far. It's not really known at this point.
To be honest, since you said you're looking for a more exciting drive, don't go for the Model S. Not my personal testimony, but I hear the Model S is a bit of a boat. It's insane for straight-line acceleration, but it doesn't hide its massive weight around the city or in corners. The LR Model 3, while still being a beefy 4000lb vehicle, carries its weight much better and surprisingly well.