It always depends. Sometimes the 망가 bothers me, but other times it's the 아니메 that bothers me. Like... I tried 읽기 Ouran, but it made me confused. And after 읽기 Fruits Basket, I yelled at the anime. I usually try to read the 망가 first, but sometimes I'm just in a rush. If I watch the 아니메 first, I'll usually read the 망가 to see the difference.
I think both, but it depends on what it is. Like, if I'm shown the 아니메 version first, I'll probably only watch the anime. But, if I find the 망가 first, I'll 더 많이 than likely watch the 아니메 for it too.
Example: I started watching Soul Eater and 두라라라!! before I knew there was a 망가 version of each. So kinda just stuck with the 아니메 version because I'm too lazy.
Enjoy the picture that doesn't even fit the conversation!! >w<
망가 is 더 많이 portable for me than anime, but I still have to go with anime, as 망가 can sometimes be hard to understand. Like 당신 don't know which character is speaking, 또는 what a picture is depicting.