Pros and Cons of Assigned Parking
The biggest pro for assigned parking is consistency. You have a spot every time you need it. You don't have to worry about the parking lot filling up. You know where you're going to park, and it's usually close to your building or door. The biggest con is that assigned parking usually comes at a price. For those willing to pay the price, it's a good option. However, not everyone can afford the added monthly payment of an assigned parking space.
The other major con is the annoyance of other people parking in your assigned spot. You have to deal with confronting whoever parked in your spot. Not everyone follows apartment parking etiquette. The other option is to contact the landlord or property manager to deal with it. In that case, you're not waiting on them to take care of the issue. You could always call a tow truck, but you're on someone else's time again. Until then, you don't have a place to park.
Pros and Cons of Garage Parking
Like assigned parking, the biggest pro is that you don't have to search for parking. You have a dedicated spot to park your vehicle every time. You're also offered a bit more protection this way. Your car is covered in the event of storms.
Garage parking normally comes at the steepest cost, however. If you can pay for it, garage parking is likely the best option. The other con to consider is whether or not the garage has an electric opener. It's a hassle to get out of your car to open the garage every time you need to park. Some older buildings don't have electric openers. So, it's something to keep in mind when looking at apartment parking options.