Korg B2 is a digital piano that offers 88 full-size weighted keys with velocity and aftertouch. It also has built-in speakers, USB and MIDI connectivity, and comes with 25 onboard sounds. Yamaha P45 is a digital piano that offers 88 full-size weighted keys with velocity and aftertouch. It also has 64-note polyphony, USB connectivity, and comes with 10 onboard sounds. When it comes to features, both pianos are pretty evenly matched. However, there are some key differences that may make one better suited for your needs than the other. For instance, Korg B2 has more onboard sounds to choose from as well as an included sustain pedal, whereas Yamaha P45 does not have an included sustain pedal but does offer more polyphony (64 vs 32). If you're looking for a portable piano that you can take with you on the go, Korg B2 would be the better option since it's slightly lighter and smaller in size than Yamaha P45. Ultimately, the best digital piano for you will be the one that meets your specific needs and preferences.