Convenience stores

I'm used to 711, Family Mart, and Lawson's in Japan. How do the convenience stores in HK hold up? I know HK has 711, but do locals prefer a different store?

Also, what are some of the must try items in HK convenience stores?

Edit: I've read all your replies! Thank you very much! I made a note to avoid the menthol tempo tissues if i need some tp lol