On the deliverability piece - tool choice barely moves it. Lemlist, Apollo, Outreach, Smartlead all sit on top of the same underlying email infrastructure. Placement is driven by authentication (SPF/DKIM/DMARC alignment), warmup discipline, list quality, and sender reputation. None of which a platform's UI fixes.
Evaluate Lemlist on what it actually controls: sequencing logic, personalization depth, LinkedIn integration, reporting, and how it handles inbox rotation under the hood. If deliverability is the actual problem you're solving, switching platforms won't get you there.