parallax

Interested in peoples thoughts on the following: how essential is adjustable parallax on a 2.5 - 10 scope that will only be used for deerstalking out to 250yds?

I'm looking for a scope for my rimfire, switch barrel .22LR and 17HMR. I'd like zoom with parallax adjustment, I've narrowed it down to Vortex DiamondBack 4-16x42 or Nikon Monarch 4-16x42. Any experience of these or any other scopes that I should consider? Don't want to spend silly money.

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