[Affinity Photo...Desktop(Mac) or iPad?]

I want to buy Affinity Photo, but I am not sure if I should get Desktop or iPad? What do you think? Pros? Cons?

[My 1st post!]

Well hello everybody! I am a brand new Affinity user. I just came over from Gravit. However gravit is doing some funny stuff and I decided to shop around for something and I was willing to pay a fee instead of looking for free software out there. So after playing with affinity for a few days, I am completely excited about using Designer, and the other products from them. 

My first question, is if I go with the iPad version as well, do I have to pay completely separate fee for that. It's not downloadable for free or anything like that, is it? Since I already paid for the desktop version?

 

My second question, does Affinity  offer bundles? Like if you buy all three of their software offerings, do they offer a discount or anything like that?

 

 

Finally, how long do I get free updates after I purchase offer? Is it forever? Or is it just for a certain amount of time? 

 

Thank you for all the YouTubers out there that help with their tutorials! They are so helpful.