HubSpot VS ActiveCampaign
Both sides have their strengths
Recently I've been working with both CRMs for two different clients. And yes, of course, you can use them both together, but granted, it can get quite messy. I have to use a lot of zaps (Zapier) to make sure they are synced up well.
So which one is better? It depends. It depends on what exactly are your client's needs.