Germinating seeds in seedling trays help you to be more organized and is easier to transplant later into your grow system.
Growing in seedling trays gives you greater control over growing conditions, such as protecting the soil from pests or allowing the seeds to germinate in a protected environment like a greenhouse. For this reason, the success rate for indirect seeding is higher than direct seeding, and will therefore yield a greater crop.
Highly recommend using cocopeat or CRH as potting medium.