I moved to GSuite myself from Sendgrid. Paying $20/month just to get issues with Hotmail e-mails being blocked because of IP reputation issues caused by other clients, and I'm sure not paying $100/month just for a dedicated IP so I can avoid issues I had less often sending mail locally from my server.
Google Suite seems to just work. You also get to set an avatar for users that use the GMail app to see. I considered Amazon SES before moving to GSuite but never have tried it, so not sure how the deliverability is in comparison.
The main limitations with GSuite are that it's a little more of a pain to set up, it requires SMTP (there's no API, though I mean, it's Google, so even their SMTP servers are reasonably fast) and there's hard-capped sending limits (3,000/day was the old advertised limit for G Suite but I've seen posts suggesting it can be up to 10,000/day).