I like Decker to be Peytons security blanket (he always has one). You can't go wrong starting Brown though both are very enviable WR3's Decker does have the tougher matchup and Wallace has missed a lot of training to his contract dispute. After all is said and done I would go with Brown this week, but as the season progresses and Wallace returns to form I would go Decker over Brown almost every week.
check this out VVVVVVVviewtopic.php?f=19&t=517371
10 team 1 QB, 2 RB, 3 WR, 1 TE, 1 K, 1 DEF
P Manning, RG3
A Foster, CJ Spiller, B Tate, V Ballard, D Williams
D Thomas, J Nelson, Mike Wallace, Cecil Shorts, Danario Alexander, D Heyward-Bey