It isn't actually the voltage that is the consideration, it depends on how the armature is wound and that decides the amount of torque that can be applied.
It's a bit like using a 5 watt bulb or a 55watt bulb on your car, the 55 will produce more light but consume more current, that's what the armature does.
That said, 14 volts is more than adequate for most purposes.
Some of the small 12volt impact wrenches have a huge amount of torque and that is compounded by tHe user keeping the trigger engaged long after the ratchet has disengaged meaning they over torque by quite a bit.
Once you learn to listen and feel the gun you can be reasonably happy that you have tightened things sufficiently but a manual check does no harm.
Get a 3/8 drive if you have a choice between 1/2 & 3/8 as they are less cumbersome.
When choosing sockets, it is preferable to use proper impact sockets although they have thicker walls, but if you choose normal sockets make sure they are 6 point and not 12 point as the 12 point will round off k nuts especially and you will have to quIckly find a 6 point to borrow to get your wheel off!
Buy a quality socket as cheap ones can shatter.
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