After using Mikrotik routers almost exclusively for many years I have recently switched to Ubiquiti's EdgeRouter 4 to accommodate the orders of magnitude greater bandwidth delivered by Google Fiber.
The main reason for switching to the ER-4 was that there simply wasn't a Mikrotik device in its class that was close to the price. As it turns out there is also somewhat more (and more recent) online advice available on replacing Google's Network Box with an EdgeRouter. I was heavily influenced by the specs for the GFRG200 that Google furnished us with in determining my minimum requirements (1 GHz CPU, 1 GB RAM, etc) for a new router.
The primary resource I used for this project was this repo from Mike Potts:
https://github.com/mjp66/Ubiquiti
The 180+ page guide "Ubiquiti Home Network" is probably the best practical documentation on Ubiquiti networking I've come across.