Between the monthly subscription and the email credits, which one is the best?

It all depends on the frequency and volume of emails that you want to send. If you wish to send emails regularly and have a large contact list, a monthly subscription would be the best option for you. On the other hand, if you don't send emails often then the credits would be a better option; as they will never expire. Clients with a credit plan, or with a monthly subscription with a Bronze Plan (60,000 emails/month) or higher, have unlimited access to all the features and functionalities of SendinBlue.

Don't forget that you can change or cancel your plan at any time. You can start with a monthly subscription and if you see that a credit system would be best for you, you can change plans without problem. Once you are ready to send emails regularly, you can go back to a monthly subscription.