Why there seems to be different conventions of QCD energy scales? Is that due to the running coupling?
For example in Wikipedia https://en.wikipedia.org/wiki/Coupling_constant#QCD_scale: $$ \Lambda_{\rm MS} = 218\pm24\text{ MeV} $$ and also some search of the article https://inspirehep.net/literature/296684: $$ \Lambda_{\rm MS} = 254\text{ MeV}. $$
However, from Lubos and others What is the significance of the QCD scale parameter $\Lambda$?, it seems that people also set $$ \Lambda_{\rm QCD} = 150\text{ MeV}. $$
So what exactly defines the QCD energy scale? $$\Lambda_{\rm MS} \text{ vs } \Lambda_{\rm QCD}?$$
How do they relate to confinement and pion mass?
