GS racing were a few years ago a solid club racer buggy with the original Storm.
However time passes and it became outdated.
GS turned to Claude Lechat, who has designed quite a few buggies, to design their 'new' Storm, hence the CL-1.
It had quite a few inovative ideas but didn't quite get GS back to where they wanted to be.
The pro version was designed outright to be a racer though unlike the X-terminator and protos, which were designed to be a beginner/basher buggy.
Like all maufacturers these days they produce cheaper RTR versions of their top line buggies.
Of the 3 you listed i'd get the CL-1. At leat you will have a pro-level upgrade path.