Here's the thing, whether Hillary is more of a war-monger than Rand Paul isn't the main issue. First of all, Hillary's base doesn't want more war, unless there's just no other viable option. Rand Paul's base, on the other hand, loves them some aggressive, fire-from-hip foreign policy. Then, President Rand Paul is going to be surrounded and supported by war-mongering Neocons from his cabinet down to RW media. They'll push, and he'll comply if he intends to keep them placated. I don't see that being the case with Hillary.
And no, Hillary wouldn't be my first choice.