MAMP Ruby vs macOS system Ruby

Question

I am about to install a newer version of Ruby so I checked the following things-

1. Which ruby

/Applications/MAMP/Library/bin//ruby

2. ruby - v

2.6

I don't like to use Mamp Ruby as I want to use a newer version of Ruby probably 2.7 (as it supports the application).

Also when I do which ruby it doesn't show Mac Ruby version.

Is it OK if I install a Ruby version manager like chruby. Would it interfere with any other version.