Ektar 100 or Ektachrome for a car show?

Hey everyone. Next month i'll be shooting at a car show for modified cars. Lots of bright, bold colours but also both indoor, and outdoor. Now i know that I'll be able to use a tripod so slower shutter speeds, especially with a polarizing filter are not an issue. It's not a professional shoot, just mostly friends cars and others that will stand out to me. I'm just on the fence between Ektar 100 and Ektachrome. I know that back before digital most pictures of car ads and shows were shot on slide film, but have never shot it properly before (except experimenting with higly expired fujichrome with the expectable results.) My camera has a good, reliable light meter and i'll be exposing for the car as it's the subject. Maybe going up or down a stop depending on the colour and reflectivity. Which one would you choose and why? Thanks in advance!