Personal vs business email?

Business Email. I like keeping everything separate.

I tend to sign up with an email that allows me to identify the service. For example if my email address was mike@example.org I would use mike+sitename@example.org. The email spec treats the 2 emails the same (works in gmail and everywhere else). This allows me to understand how my emails might be misused, and also allows me to do filtering in my email client by incoming email address.

I have separate addresses for everything

Depends :) If this is related with my business I am using business email, but If I want just try SaaS I am using personal emails

Separate. It's very easy to create email aliases if you use a hosted email service. It also helps to reduce failure points in case an account is compromised. .eg You could have social@company.com for social media related site, admin@company.com for administrative tasks, billing@company.com for billing related SaaS emails. e.t.c

I use my personal and business emails.

Separate! I have like 10 inboxes