My honest recommendation (not hedged)
For the next 6–12 months:
WordPress (Thrive) is the canonical home
Email is secondary and supportive
Simplicity > optionality
Focus on business trust, not audience scale

That points to:
Constant Contact (or similar) being the right choice right now
Beehiiv becomes relevant only if:
KAW turns into a true audience product
advertisers come to you
or you want passive monetization without selling
You’re not there — and may never want to be.

