Haven't heard Zendaya yet, but I loved Replay and a bunch of her other songs too, so I'm expecting that I'll like it!
Of the others:
Stars Dance got boring really quickly, the only songs that I enjoy are Write Your Name, Stars Dance Nobody Does It Like You, and Music Feels Better. Undercover is okay as well, the rest is pretty boring to me.
Yours Truly is solid and good, but not really an album that I would go back to, I liked it the first time I heard it, but meh.
DEMI is all kinds of terrible, she has a couple good songs here and there, but the lows on that album are just

I much prefer her pop-rock sound like Here We Go Again.