Men's 3/4 Sleeve Casual Raglan Jersey Baseball Tee Shirt (M, Black/Light Gray)

Cotton Shirt is pre-shrink. I wash it twice in hot water and sun line dry them. Color dyed stay fastened (blk sleeve/grey body). My shirt size M, got plenty room under arm pit. Now here the thing, I also brought size S, hot washed, line dry. Lay both shirts M and S down back to back, both sized sleeve is same length and body length. On M, arm width sleeve 1/2 inch wider, body width 2 to 3 inch more, more room on arm pit. So which one do I wear ? I like my shirt little loose, not baggy or tight skin. I'm 5' 7" , 145lb.