A Few Questions To Help Me Decide

Greetings!

I´m an amateur game maker who might have the ambition to sometime publish a game onto android and iOS. I just wanted to ask you folks here about the pros and cons (if there are any) to switching from Game Maker Studio (from YoYo Games) that I have been using for some time now and am quite fluent in the GML language it uses. The lua language won´t be a big problem since it is very similar to AS3.

So any insights regarding dev-speed, performance, ease of use and so on between the two would be much appriciated.

Thanks.