Yes, when there's a range of legal V1s (i.e., on the vast majority of T/Os, sometimes even when using reduced thrust by the assumed-temperature method on a very light a/c), it depends on what you mean by "optimum"!
On a 4-engine a/c, at an airfield with no engineering support, you might choose the minimum V1. At base, you might choose the maximum. Discretion suggests giving yourself a bit of "fat" in either case, however.
