Whether to direct sow seeds or transplant seedlings is a great question to ask before planting your garden. Does it matter? Which one is better? The answer: it depends.
Here are a couple articles, a video, and a chart to help demystify the question and make it easier for you to navigate the answers.
These articles from Cornell CALS & OrganicGrowersSchool.org are simple, helpful, and informative.
This video from Josh Sattin Farming is relatively in depth and chock full of useful information.
Lastly, here is an excellent chart from High Mowing Organic Seeds.