Looks like it is a Gen 2 controller within Gen 3 body.
Based on information I found on another forum (link), this is what people receive when they ask Rachio staff over the email:
The R3e Smart Sprinkler Controller offers a lower-priced entry point for customers looking for a weather-based smart sprinkler controller. The R3e lacks the following features available on the Rachio 3:
Weather Intelligence™ Plus
Flex Daily
Yard Map
HomeKit
Future premium software features
Any wireless integrations
Looking at the list, it is still better to buy a Gen 2 controller because that one comes with a Flex Daily support, this is the best schedule type you can use with a Rachio controller since it can be customized to emulate the other schedule types and it is the only one which actively tracks your available water within each zone.