At first ,I thought you were looking for an entry level keyboard..Then I realized you are considering 2 of the best arrangers on the market..Both will do what you want..Style and sequence editing is easier and better on the Roland..Patch editing edge may go to the Korg[maybe]...My preference, although I have not played one,but I am familiar with the features found on it...G70..

I have played the Korg..I like it ,but not overly impressed with it..The MP3 option would be the only reason I would consider it, personally..

You probably would not need your Yamaha module with either keyboard..but it is most likely a favorite of yours..