They're both running their websites on cloudflare-nginx, but bernie has had his domain registered since 2001, while trump since 2007. On the other hand, bernie's server doesn't support IPv6, and his SSL cert runs out in April, while trump's lasts almost to the election. Lastly bernie's server was vulnerable to heartbleed, while trump's never was.
So if I had to choose who I'd have set up my web server, I'd go with Trump's guys over Bernie's guys.
Then I'd burn the server down and set it up correctly.