Disney and Universal are two entirely different parks and experiences. Disney is best for a family with older kids and Universal is more for a family with older kids, but still stuff enjoyable for younger kids.
Both have their resorts with shuttles, buses and boats, but you get what you pay for at all the different tiers. Disney I believe does have more transportation options, but they have a ton of land. Come on, they have a monorail lol.
Neither Disney nor Universal can truly be enjoyed 100% with all the activities with those 3-4 day packages. You can buy fast passes, which will tremendously improve your experiences and they are included in some resort tiers with your stay. It is hard for either park to keep lines short with the amount of people that visit.
Both have events all year round, so unless you visit them you will be missing out on those experiences.
New Years at Disney is a must. Halloween Horror Nights at Universal is a must. We hear the wine and food festival is great at Disney, but we haven't gone yet.
I don't think Universal will ever match Disney, but we prefer Universal as their ticket packages are more affordable and we enjoy their events and parks more. Of course, we are definitely looking towards the new park.