Like that I can adjust the Guga Ribas mag pouches. CR speed is the staple of the IPSC community for belts,...and there holsters and mag pouches are top notch.
It comes down to personal preference. With the Guga, the inserts allow the use of my HK mags, and my Tanfoglio mags,...as well as my STI .40 mags (when I had an STI). IT has more inserts, so I think you could use Single stack mags as well.
I am using the Ghost for my tanfoglio,...although I had the Speedsec for my HK and StI. That being said, I think the Speedsec is limited more than the CR SPeed WSM2, in that you can use the CR holster for many different firearms,....the SPeedsec is made for individual firearms. (ie: you can't use it with different firearms, only the firearm it was made specifically for)
If I had to choose between the 3 (CR, GHost, and Speedsec), I would choose the Speedsec.