I have written plenty of articles about TOR over the years:
Is TOR really anonymous
We know that large scale government actors that control many of the TOR exit nodes have techniques to deanonymize TOR traffic, but this is still difficult to do and TOR is still the most reliable web anonymization technique available.
The Onion Browser
The Onion Browser was released ion 2012 by a developer that wanted to scratch his own privacy itch on IOS. Like many good products, the developer (Mike Tigas) built something he needed and published it at the cheapest rate ($0.99) Apple would allow [just to see what would happen].
The team behind my favorite Android TOR products The Guradian Project (OrBot and OrFox) has decided to support the Onion Browser. The most visible change will be a full app rewrite with a new interface.
Additionally Onion Browser is the TOR project recommendation for IOS.
I would say go and download it now.