I have a Google Apps for Business, Education, and also Office 365, all for work, and Office 365 for personal use. I like them all for different reasons, as they are all being used for different purposes. I haven't had any issues with any of them.
I got my Gmail address back in the early days of Google. this was back when first.last and firstlast were two different email addresses. Now I'm getting email addresses to firstlast ever since Google apparently "merged" email addresses. Not a big deal as I have a rule set to send anything addressed to firstlast to deleted items.
I and curious to know the reasons @
blundmark is looking for something "more secure".