Go with the domain that has the greatest brand marketing potential. Don't worry about SEO when it comes to your domain. You can definitely do well with odd TLDs like the .io or others. I've done it recently with mobile development client that has a .us. Their site did VERY well in organic, and still is doing well after over a year.

From experience, adding buyer keywords or call to action terms like "get" "buy" and others in the domain can entice more click thru. Its a call to action in your domain.