Since the Excursion is no longer being built, I assume you're looking for a used vehicle. Avoid 04 - 05 excursions, and 03 suburbans, and 06 suburban 2500's. The 05 Excursion has 7 problem areas which are rated "much worse than average. The 05 Suburban has one problem area which is rated "below average". Based on these figures, the Suburban is way better. The Excursion's reliabilit stats are absolutely terrible.