  We reassess the $B\to\pi\ell\nu_{\ell}$ differential branching ratio
distribution experimental data released by the BaBar and Belle Collaborations
supplemented with all lattice calculations of the $B\to\pi$ form factor shape
available up to date obtained by the HPQCD, FNAL/MILC and RBC/UKQCD
Collaborations. Our study is based on the method of Pad\'{e} approximants, and
includes a detailed scrutiny of each individual data set that allow us to
obtain $|V_{ub}|=3.53(8)_{\rm{stat}}(6)_{\rm{syst}}\times10^{-3}$. The
semileptonic $B^{+}\to\eta^{(\prime)}\ell^{+}\nu_{\ell}$ decays are also
addressed and the $\eta$-$\eta^{\prime}$ mixing discussed.
