Neither of them is a creation ex nihilo . In respect to the source. In respect to effects. Generation yields not only personality, but resemblance. In respect to order of relationship.
Generation is second, procession is third.
138 Serm. in Joh. Luke x. 30, 34. 5 and John iii. 145 John xiv. Deus quam sapientiam esse hominis utique veram Divina Scriptura definit.