As one of Vuo's developers, I work on Vuo's engine (the thing that makes compositions run), work on nodes, and write documentation. You'll see me on the forums answering people's questions about Vuo.
I've been developing apps and frameworks for several years (since I was in college). Pre-Vuo projects include Kineme Quartz Composer plugins, iOS apps for education, an app that analyzes photographs of tomato slices, and software to help people with disabilities use talking keyboards.
I enjoy using Vuo to make live music visuals. My hope for Vuo is that it will grow into a community of people of diverse backgrounds and identities making lots of different artistic, useful, unique, goofy, beautiful, crafty, wonderful compositions.
Probably the first option since it has fewer operations. But since your CPU can do billions of floating-point operations per second, you'd have to be dividing a lot of numbers for it to make a perceptible difference. Also, it takes way more CPU operations than just that little math expression to execute the node, copy the outputs to the connected inputs, etc. It's nice that CPUs are really really fast :)