If you are flying in, the Madison International Airport (MSN) is going to be the most convenient. Ubers to the hotel are ~10-15 minutes and most activities are within walking distance of the hotels, so you shouldn't need to rent a car.
If you are driving in, the hotels have parking options and getting into the downtown area is pretty easy overall.
The Hilton Madison Monona Terrace is directly next door to the wedding venue. It is also just blocks from the capital and many of the downtown Madison amenities.
The Embassy Suites is a quick walk from the wedding venue. It is also located firmly in downtown Madison and is within walking distance of many of the downtown amenities.