Modx is a synth for creative individuals so no easy play backings. (You have to put the work in but you can become an individual that people can recognise)
An arranger is an easy play keyboard where you can press a button and everything is done for you. (You pretty much end up sounding the same as every other arranger player, which means that while people recognise the keyboard the player gets little recognition (Although if you sing it can help)

Bill