I prefer creating a unique email alias from dots more than plus. Especially if I sign up for something I'm worried will leak my email address to a third party, I use the dots. A malicious sharer of emails could trivially strip all the "+site@gmail.com" before sharing, but they can't know ahead of time if they get my primary email by adding or removing dots.
Also, a few times when I've signed up with "name+service@gmail.com", I've then failed to unsubscribe because their unsubscribe form didn't accept the + but the subscription form did.
Also, a few times when I've signed up with "name+service@gmail.com", I've then failed to unsubscribe because their unsubscribe form didn't accept the + but the subscription form did.