Out of those two, you can control the Roland with an ipad? Sounds wise - they both have a decent selection and seem to sound OK - the Roland electric pianos I like better.
The only snag with these products is that they're built to work with the home organ style customer. Select reggae, play a chord and magically a bass line and chord backing appears. They might have a few adjustments, but they're very predictable. Calling them 'arranger' keyboards is a bit of a laugh - you get to play a melody against pre-programmed drums and chord patterns, usually with predictable bass. Nice, but dull - and they're rarely inspiring. Very often even if you create something brilliant, you cannot get the 'sound' out to a computer for more advanced work. It probably will export the MIDI date for your left and right hand, at the right tempo, but the rhythms and articulation of chords and the bass rarely are included.
They are great form playing loads of old favourites simply - but they are not that good for composing and arranging - people who love them tend to be er, less musically able, yet can produce nice sounding stuff, but are more home organ customer than real musician. You can make great music very quickly just by playing three note chords in root position and bashing out a melody. If that is what you want to do, they're great products. Most serious people use DAWs so they can have loads of sounds and do lots of editing. Arranger keyboards are for more casual musical people, who want fast access to something nice sounding - but they never do what you need. If you have 200 rhythms, how useful are bossanova patterns or those horrible country ones? so many are just unusable - not because they are bad, but out of each style, there are only a few of each one in each genre. I had one years ago that let me play Stevie Wonder's I just called to say I love you. The backing was spot on, and it sounded great. Trouble is, it was only great for that one song - that backing didn't fit anything else. Another was Lady in Red, same thing. When you press the button on the current ones, I heard (on Youtube) so many that rang bells.
Years ago, I loved mine. Then I realised it just couldn't grow with me.
