Either of Instantly or Smartlead should work the best for you if you are focussing just on email campaigns.
But if you are looking to do omnichannel Campaigns, I would recommend this stack:
Step 1: Bitscale (For list building and intent enrichment)
Step 2: Instantly/Smartlead for Email Campaigns
Step 3: Heyreach for Linkedin Campaigns
You can generate high intent ICP list on Bitscale and push them to Email and Linkedin Campaigns on the respective tools.