Being a micro framework it's more similar to Sinatra than Rails.
In terms of main differences, it's PHP rather than Ruby which means it's verbose rather than terse and it's less automagical than Sinatra / DataMapper.
If you need to use PHP for a project, then it's a great choice, but if you don't then you're better off with Sinatra (or Express and Node depending on what you're wanting to do).
In terms of main differences, it's PHP rather than Ruby which means it's verbose rather than terse and it's less automagical than Sinatra / DataMapper.
If you need to use PHP for a project, then it's a great choice, but if you don't then you're better off with Sinatra (or Express and Node depending on what you're wanting to do).