These are both great airplanes. I am on my second Extra 300 over the last 10-12 years, both with a Webra 120 in them. And I have the Ultimate that is about 10 years old, with a 108 ASP. Your 91 will fly either one "nicely" but not in a breath-taking manner. Pick the one you think is the neatest and go for it!

Clair