I actually own a Bill Alexander piece, and there is quite a bit of difference in their art. Ross' work though a little more crisp and animated, does not have Alexander's aura and feel on a landscape.
With that. Both used the "wet on wet" technique (Alexander invented). Problem is Alexander does not have the recognition factor.
The Alexander piece I own is probably worth no more than $500. Ross is worth 10X for his iconic value alone. Just as Picasso is worth 1000X for the same reason.
If anyone is interested, here is some young jaw dropping talent. Don't worry about buying one of his works. You have to put in for a drawing with 500 other people, just to get a chance to pay gallery price.
sw gallery