We had the same dilemma this past May, whether to drive from Worcester or take the train. We chose to take the train. We did book a family sleeper car and although it was nice and private, I couldn't sleep with all the wheel noise. The family car is on the lower level at the end of the car. I would try the train again but I would book two sleeper units on the upper level only. I would need two to sleep the three of us as the units only sleep 2 apiece. We are about to leave next week for WDW again. We've opted to drive the entire trip this time. So I'll have a pretty good feel for the answer to this question on 10/23 when we get home. I have a 4 year old so the age of your kids might make a difference. My daughter did extremely well during the trip to Lorton, VA. Let's see if this holds up all the way to Florida. Fingers crossed!