I think i understand how you feel i was at that point where i felt like i wasnt so good a drawing manga but the thing is anyone can draw as good as a professional you jus need to practice though if you decide not to draw but collaborate with an artist your writing style must be in sync with the art style you collaborate with. In regards to the importance of either jus drawing the art or writing is that without a good story plots and characters there is really not a good point in reading the manga even if it has good art. Though it is good to have a really unique artist to the story their art is used to ephasize what is occuring in the story , the art pulls you to the words or the meaning in which you want to potray. I hope i have given some help and i believe you shouldnt worry about which one gets more attion the story writer or the artist? No without either one being good you cant create sn amazing manga. C: