Pallas
I think Bell's pieces are better. Dow's music certainly is. A lot of Robertson's stuff sounds like the same basic RH melody, played on the same keys. It's all a monotone musically. At least to me.
One thing I was really wanting was music I could use to improve my technique and musicality. Some call this being more lyrical, and it is to some extent, but it's actually more than just that. If you look at videos of people playing beginner music you start to notice one thing they all have in common - choppy fingering. If you look at more advanced players you start to see something different - a lightness where the notes are played almost by stroking the keys. It's that difference which I was looking for.
If you look at your own videos (and mine too) you'll notice that it's almost like you're playing stacatto all the time. Your fingers go down then up, move to new keys, go down then up, move, etc. There's no fluidity because the music is broken into pieces rather than being a whole.
Part of that is because beginners have no technique and this is the only method we can use to hit the notes. But, when I played Bell's Butterflies it was different from that in both the musicality and physical movement of playing.
https://rumble.com/v4lvex0-butterfiles-by-angelina-bell.html
Watch the last few seconds of my LH in the video. You'll see that it's much lighter and more graceful than anything I'm playing in my method books. The RH is like that too but it's not as noticeable.
This lyrical quality is what makes the music sound better and makes it more attractive to me. Robertson's music that I've sampled doesn't seem to have that. It still might have it in stuff I haven't listened to, but I've yet to find it.