Hi, my question is if there exists a study systematically comparing different cosmological models in how well they fit the same standard cosmological data sets (CMB, luminosity, BOA, SNe, lensing,...). I can find very little besides LCDM. In the rare case of a comparison, it leads to confusion. For instance, Melia claims that a coasting model ("Rh=ct"), i.e. ρ∝a-2 fits data beter than LCDM, leading to long (perhaps unnecessary) disputes over the subject, while my impression is that Melia did a serious atempt. Apart from this particular case, do comparisons exist of LCDM with the single fluid model where ρ∝a-1 and with the dual fluid model where ρ1∝a-2, ρ2=ρΛ∝a0, and possibly other models? I would very much appreciate if someone could help out.