Pick Brevo if
ops / ecommerce teams who will stay on Free at $0 (300 emails/day, 100,000 contacts) while they open a first Email campaigns list, then Starter at $9/month ($97/yr) when they need 5,000 emails/month — not Standard $18 unless they need unlimited-contact automation, and not Professional $499 unless they need WhatsApp / 10 seats.
Read the Brevo page