Which is better for wood surfaces in painting: two coats of new paint or one coat of primer and one new coat?

Which is better to prevent flaking and cracking of the top coat of new paint?Which is better for wood surfaces in painting: two coats of new paint or one coat of primer and one new coat?
one coat of primer and one new coat - always take this option when available.Which is better for wood surfaces in painting: two coats of new paint or one coat of primer and one new coat?
Primer on bare wood first.....then paint away