Corona SDK

On the front page of Corona it says "The only 2D development platform with real-time device testing" - however Gideros (another Lua framework with IDE) is able to do this for more than 4 years.

Why should I use this instead of Unity3D? Unity Plus is much cheaper.

It's been around for a while, I was in love with it, I used it a LOT for games and apps in 2010/2013. Did something changed recently?