I really depends to your needs. But Ruby has a great ecosystem to build large application without reinvent the whell. If you choose Ruby on Rails you can build an API compliant to JSON:API standards with JWT token auth, email validation, unit test and even deploy on Heroku in only one hour. Check my free e-book if you don't believe me.
With Golang you may spend this hours to choose the right library.
I really depends to your needs. But Ruby has a great ecosystem to build large application without reinvent the whell. If you choose Ruby on Rails you can build an API compliant to JSON:API standards with JWT token auth, email validation, unit test and even deploy on Heroku in only one hour. Check my free e-book if you don't believe me.
With Golang you may spend this hours to choose the right library.
Please do not listen people saying Ruby is dying. Github himself run on Rails 6.