I would go for Lionstracs, as they have transformed something that Wersi started, (Openness) but due to limited funds could not progress it as fast as could have been. (However usability wise (Easy for anybody to use) Wersi OAS still leaves Lionstracs in the dust)

The main thing with Wersi though, is that they were the first manufacture that did not tie you in to what the manufacture provided, which to me is the biggest advance ever. (But then I was using computers and VSTi long before I had a Wersi, so was used to NOT being dictated to by the manufacture)

It will be interesting to see how Music Store progress OAS.

Bill