I think a studio recording will always be technically better than a live performance. As already mentioned, the engineers will most likely do a comp of the best takes, so a flawless performance is a given. Also, then recording environment ensures a far higher sound quality to disk. So in the end result, both the pianist and piano are sounding next to perfect.
Ofcourse, this is technically. Its not to say that an engineered performance will have that 'little something'. Maybe you do need the concert hall for that, Im not sure.