If you are looking for background blur with any lights in the bacground to appear as smooth round points of light, then the 1.4. If you want exremely sharp, not necessary flattering, then the macro will work.
Personally, I like using an 85mm, and I use the 1.8 and make sure to get close to the and leave a lot of distance to any objects behind them. I also like to make sure that they have a background that contrasts with their hair, and I like to get a light source behind them that highlights the hair. The lighting is more important than the lens to me.
"Racing is life. Anything before or after is just waiting." - Steve McQueen