I've had much success with growing bushes of aromatic plants from little stems with 2-3 small leaves. Seed propagation is much slower, however, I figured you can do much more long term with it. If you propagate one plant of sage to 10 cuttings, with 100% luck, you will probably have around 1000 cuttings after three years of growing the cuttings into bushes. With seeds, you can fill containers with plants since they stay small for the first few months/years, when they get big you can transplant them to individual pots and have thousands of plants that all have slight genetic variations, which is very important for resilience.