Best Outbound Tool Comparison: Smartlead vs Instantly for Email Health

We are currently evaluating outbound email tools, specifically Smartlead and Instantly, with a strong focus on ensuring high deliverability and maintaining good email health. However, in our research, we've encountered mixed feedback on both. Additionally, we are looking for a tool that can facilitate the creation of new domains and multiple email addresses, including seamless setup of SPF, DKIM, DMARC, rDNS, MX, and custom tracking domains. Could you please advise on the best setup to achieve optimal email deliverability and domain health? Any recommendations or insights would be greatly appreciated! Thank you in advance for your help. 😊