roimulia

Hey guys,
I'm really banging my head about this choice in the couple days.
just finished my first game app for IOS (only) , it's in the same concept of Ketch-app games if you are familiar.
this is my question :
i came to conclusion that the best 2 ads networks that i can use are ADMOB(+ i heard they are banning lot of accounts) and CHARTBOOST :
1)which one should i choose based on your experience?
2) Should i use mediation and use both?
2B) If i use both , which one is the primary?
i just cant find clear answers for this question , i hope when have you with the (alot) more experience can help : P
wish you all good and earful week !