Bars, and by a lot.
I don't care much for the design of bars vs dots, but one necessity for me is the fact that the dots needed to be blank when not filled in.
I'll show an example below.
My previous jailbroken status bar theme on iOS 8 (below):
Current iOS 8/10 dots:
I personally found the border of the empty dots to be kind of hard to read at a glance, with a small screen and crowded area up top. I like the jailbreak theme's implementation better.
Either way, I welcome bars back again, which to be honest is even better. I don't have terrible memories of super old android, so I'm not opposed to it.