Netcore is the only alternative of these that is both reputable and has the same pricing as Amazon. All these others, sendgrid, mailgun, mailjet, sparkpost, bird.com etc. etc. will charge some premium over the SES .10 per 1k rate.
Netcore is the only one of these that will deliver high end service and reputation management at the best price. I have used all of the above over the last 20 years.
Also, unlike Amazon SES, with Netcore you are not a the whim of some unknown 20 something banning you, or throttling you for reasons you can’t figure out.