The verdict
For most small teams, pick Meta Ads first. It has the wider audience, works with simple image ads as well as video and lets you test demand without a studio. Message ads also give you a direct route to a conversation.
Pick TikTok Ads when your product suits a younger, visual audience and you can make short native-style video regularly. Direct-to-consumer and e-commerce brands are the clearest fit. Treat it as an experiment with a fixed budget and a clear stop rule, and judge it on cost per customer, not views.
If you sell a complex B2B product to an older buyer, neither is your best channel. Look at LinkedIn Ads or Google Ads first.