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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 ρ

_{1}∝a

^{-2}, ρ

_{2}=ρ

_{Λ}∝a

^{0}, and possibly other models?

I would very much appreciate if someone could help out.