yup i own both, personally thats the best way to have it. but i know thats not a option for many.
i have owned 3 V10 4x4 excursions all with 3:73 gearing(sadly) they are wonderful trucks!!! the V10 is very reliable, its basically just a 5.4 with 2 more cylinders. i have been daily driving a excursion since march 2009 putting over 50k miles combined. i can park it anywhere..never found a spot it cant be stuffed.
differences, the excursion rides much more truck like, steering is not as light. also the excursions really need the springs swapped out for F-250/F-350 springs to make them ride/handle decently. yes it is bigger in every way..taller, wider, longer. takes alittle getting used to.
comparing the trucks MPG i see a consistant 1-2mpg less the my 5.4 expedition.
there is a ton more info if you go here
Excursion - King of SUVs - Ford Truck Enthusiasts Forums
btw i own all 3 a 2001 explorer, 98 expedition and 2002 excursion so i have all sizes covered