Off topic
Pet peeve: titles that offer no information at all as to what the thread is about at all. Imagine reading ipad’s forum with thread topics like ... ‘Can you help?’ ‘Should I get this or that?’ ‘Why didn’t they?’ ‘I have two quick questions’ ‘tell me what i should do?’
Your thread title could easily have been written like such:
"I am a gamer, what size ipad should I get?"
On topic
Run a search on the ios store to determine what kind of games you might be at all interested. Find out the number of storage space they will occupy. Do note that as you approach the capacity of the ioad, supposedly the overall performance of the ipad will slow down a bit. If you can put together a list of games that will take up 200gb, you might want to consider going for the 512gb. Also do take note that they may be coming out with a new ipad this year ... could that change your mind and postpone your purchase...
I personally got the 12.9 512gb and I still think it’s still too small.
Something I wanted to add is to consider the size of future games. Moving from something say the PS3 to the PS4, the size of the games have drastically increased, some games bordering on 50gb. What's the landscape of mobile iOS games and their reliance on space.