The Three Stooges Marathon
Haven't had experience with the two places you're inquiring about. What I can say is that if you can get it done before reaching U.S. shores, you're better off. My company is forced to clear through the same office nearly every single day, yet they act like it's always our first time.
By the way, they DO make it up as they go along. After all, who polices the Customs Department? I'm firmly convinced they arbitrarily change policies, requirements, and local procedures to "divide and conquer." It's very effective, and utterly maddening.
Good luck! Drop me a note before the holidays and let me know how you're doing!
Cheers,
Viliamu