Google says coverdell has $2k contribution limit per person and 529 has none.
We did a 529 soon after our first kid was born. The only funding was relatives who made 1-time contributions when we opened it and it has been accumulating interest for about 13 years now. The balance has barely doubled in that time. The investment choices were very limited (very safe managed but low return funds) so I never added money to it which has proven to be a good decision.
I would start a utma account and fund it. Your kid will pay taxes on the money but assuming they don't make tons of money working in college and the utma withdrawals are under the standard deduction they won't pay any taxes on it. So it can still be tax-free, more flexible for withdrawals, and vastly more investment options that you can manage if you want to.
ETA: I logged in to check since I don't monitor it, the 529 balance is up 103% since 2007. Hardly an impressive return.