$\delta_1, \delta_2, ..., \delta_k, W$ are binary variables and the constraint $δ_1 + δ_2 + \ldots + δ_k ≤ W$ holds.
Is it better to write $$\delta_1 + \delta_2 + \ldots +\delta_k \leq W$$ or \begin{gathered} \delta_1 \leq W \\ \delta_2 \leq W \\ ...\\ \delta_k \leq W \\ \end{gathered}
and why?