both are very decent mouse, so you just gotta let your hand choose, if you like the ambidextrous shape (the same shape for all SS mice except Ikari) go for AM, if you choose the ergonomic shape (IE 3.0 shape) go for EC series
That doesn't make any sense, stop sharing shit here... Sensitivity is nothing related to your size of hand or mouse. I have small hand and I use ZOWIE EC1 eVo and medium sensitivity. GTR used also IME 3.0 before sponsorship and he uses high sensitivity.