  In this work, two completely different approaches, statefinder with error
bars and Bayesian evidence, are used to distinguish and judge three
time-dependent dark energy models. The parameters constrain for the three dark
energy models are given using the current cosmic observational data sets :
$Planck$ 2015, SNIa, BAO and OHD. Using the statefinder pairs with error bars,
we find that the error region of the dark energy model, whose equation of state
parameter is given by $w(a) = w_0+w_3\frac{1-a}{a^2+(1-a)^2}$, is relativity
compact than the other two models during the all the evolving history.
Meanwhile, the Bayesian evidence also provide that this model is significantly
better than the other two models and the other two models are inconclusive.
Then, there are reasons for believing that this model is a preferential
candidate in dark energy investigation rather than the other two.
