I would go with the EMP, I find single action semi-autos a lot easier to shoot accurately than DA/SA guns and I love the 1911 design. Don't get me wrong, Sigs are great and a 220 is on my wish list, but I just prefer a single action pistol.
You're looking at two high quality weapons, I don't think either of them will let you down. Handle both and see which one fits you best, if at all possible try to fire them.
Now hatred is by far the longest pleasure;
Men love in haste, but they detest at leisure.
- Lord Byron (George Gordon Noel Byron), Don Juan
(canto XII, st. 6)