In MIP, what's the difference of solving time between the following two formulations?

1. $x_i = 0$ for $i\in I$, and
2. $\sum_{i\in I} x_i = 0$.

Suppose that $x_i, \forall i\in I$ are all binary variables.

Thanks.

In MIP, what's the difference of solving time between the following two formulations?

1. $x_i = 0$ for $i\in I$, and
2. $\sum_{i\in I} x_i = 0$.

Suppose that $x_i, \forall i\in I$ are all binary variables.