Roland Fp 30 vs Yamaha p115 both of piano are around same price roughly there is around 70$ difference between these two piano. Both of the piano have the unique features, from the portability point of view buyers are considering the weight. Here in this Roland is heavier than Yamaha. So from portability point of view Yamaha is easy to carry any place.
Weighted Keyboard Action: Both of the Piano have weighted keyboard Action that means you feel resistance when you play these piano. It means piano sound according to the amount of pressure we apply.
Roland keys have slightly textured finish and Yamaha have the shiny keys.
Sound: You will feel the variety of sound on same tune and same piece of music. Music is almost same on both of the piano.