Welcome.
Little wheels go into potholes easier than the bigger ones causing a rougher ride. Go with the bigger wheels. They look better too.
I made my chassis with 14 " wheels. Look at pictures in the "Hall Of Fame"
at the top of the page. See what appeals to you and take notes and ask questions. Gather as much information as you can and then start building.
I'm sure you've already noticed its addictive. Its probly too late. Your in it with the rest of us now
Good luck with your build and post pics. After all we have to feed our habit too
William