Which SMTP do you recommend? Is it best to use the AWS one or what are the other options?
Personally, I prefer Postmark. Their onboarding, support, and pricing is excellent. The interface is good and decent integrations.
I work with AWS service since 2015. It's true that could be a little bit too much to use if you just want the email services (SES).
For small project I just go with mailgun because it just plug and play.