Reply to Behringer cmd studio 4a VS Traktor kontrol s2

Hi everyone,

I know another question of the same type but I'm new on this community and I've been reading at the community and different threads and different articles on internet but I can't really make up my mind.

I'm new at DJing and so far I'm only mixing on my iPad with DJay (now with DJay2) but I wanna swap to my laptop and I only have the free version of virtual DJ that I used a little with a mouse.
I know buy buying the S2 I will have the Traktor software and buy buying the Studio A4 I will have the Serato software but like I said I'm knew and I would like something easy to learn and start with, but good enough to last me for a few years and I will still learn on it. It's only a hobby and I really wanna learn.
Could I use one of this controllers on the iPad too or I will need to get another one?
Which software will be easier to use (I don't care about scratching for now) for mixing and easy to understand.
What controller would make more sense to get for someone who never used one before. I know they are pretty similar that's why I can't make my mind.
I'm knew in this business and I don't really wanna spend too much money to start and learn, I will spend more with the time.


Thanks for reading and your replies, I appreciate