Hello People
Help needed on buying a 2nd hand Midi Contoller

What is the best choice between?:

Axiom 49 2nd generation or Novation Impulse 61 at the same price
or the Axiom 49 1st generation at 60% of the price of the 2 first ones?

The midi controler will be used mainly with one Ipad Pro outside home but may be used with windows at home.

Thanks for any help.