iCloud Email Security vs Gmail?

Hey guys,

I've been thinking hard about switching to a fully apple ecosystem - including email, but I wasn't sure about some things and I wanted to know if anyone here has had any experiences with both services. How secure is icloud as an email service compared to gmail? I'm not worried about stuff like labels for now. I just want to know how stable, secure and trusted icloud email is for me (or anyone) to switch to full time.