What’s your Go To TLD when .com isn’t available?

Mine is .Co for the following reasons;

1. It's short
2. It's concise
3. It's recognizable
4. It ranks 5th behind .net, .org and .io

I only have a few .co names, but I'm developing them for my own business, and I'm in the process of trademarking both because it's the smart thing to do imho.