You'd have to be pretty tall for that on the Metris. The tailgate opens up to about 78" (two canes high, my cane being 39") clearance. And given the length of the roof rack you might be able to avoid the Kayak problem, too.180s.
I've had tailgates in every car I've bought over my entire life (except for the Metris I've ordered) and I'm tired of hitting my head on tailgates. Tailgates also have limited openings when you have a long two person kayak on the roof rack.
But if you're more coordinated than I am (most people are) and don't carry boats on your roof, the tailgate probably makes more sense.