Mickey and Friends/Pixar is the fastest to get in from the 5 freeway. Security sometimes is lined up. Then you get to ride the parking trams which is good and bad. It is bad getting back after fireworks or close with lines to get back.

Toy Story is the least stressful. it isn't as easy to get to (but also depends on where you are coming from) but once in there it is super easy. never any security lines at the lot and I have always gotten on the next bus. It drops you off on harbor entrance and you bypass security there. Bus back to the lot is super easy.

Some like riding Trams over busses as Trams seems more like a ride.

FYI I still have done both for different reasons depending on the day.