Instantly vs Smartlead: Which Email Tool is Better for Outreach?

Instantly or Smartlead? What are people using to send emails? I've been using Instantly due to ease of setup -- the DFY. Even though their UX is clunky and terrible. The little box you write emails in is the absolute worst. It's like they're not even trying on the UX front-- or actively trying to make it as hard as possible for you. But just today I was with a client, had set up DFY emails 2 weeks ago, and was about to start outreach and now finding the DFY emails were never warmed (or maybe they were-- the warmup counter was ticking upward, now suddenly at 0). Also tried starting a campaign and getting an unknown error message. Absolute zero support from Instantly. The worst. They are saying they will get back to me in a few hours-- that was yesterday. Disappeared until I finally made enough noise to get someone back on. Now ghosting me again. Absolutely atrocious. So I'm considering Smartlead from now on. Of course, there is no DFY -- so this means setting up DKIM / SPF / DMARC on dozens if not hundreds of accounts per client!?! How do people get around this? Any alternatives out there for email and domain setup? Thanks!