If you have a range of V1s (assuming you are provided with this information by the Company via performance information etc) then it makes sense to pick the V1 which is most appropriate.
For example if you are departing a runway which has a vertical drop at the end of the runway (eg Luton, Funchal) select the minimum V1 since the last thing you want to do is go off the end in the event of a reject close to (maximum) V1. Also in the event of a continued engine failure once you have passed the end of the runway you'll have more than the screen height.
I you are taking off from a relatively long runway and are well below the field length limit but there is an engine out escape procedure (aka emergency turn) it might make sense to select the maximum V1 since stopping isn't a problem but do you want to be clambering round an emergency turn on one engine when obstacle limited?
Just selecting the "middle" V1 is not taking advantage - think about the situation and what makes more sense.
For every take off there will be a spread of V1s.
Not on
every take off - on some there will only be one V1.