imho, if you can afford it, ignore the price
check the reverb, and smooth keys, though it depends on your child if she's a future virtuoso, as it may be difficult to get the best-sounding one, and the fingers can adjust to minor key difficulty, but the EP with the most bombastic sound should be the best, that's why you need to check the reverb - sound is what will get her into the virtuoso vibe - not the color, not the keys, though if you can find everything in one unit, and you can afford it, buy!!! Red may be awesome but it will always be the sound that will make a virtuoso out of a novice. Also, is your child a loner or more of a socializer? If she's a loner, there's a huge chance she'll become a virtuoso if given the best-sounding equipment. As a socializer, she may go for aesthetics. Why not get her the one with rhythm, instruments, etc.? She can compose, edit, and record, and will know what instruments sounded heavenly to her - she will know what genre she might be headed to follow. If you can afford it, buy her a mic with a stand, headset, and ampli. Goodluck finding the best one for your kid