Comment by hervature

Conversely, preclearance at Pearson royally screwed up my TN visa after claiming that the other ports of entries were doing it wrong. I have received multiple TN from HOU and, in general, I like the CBP at HOU. EWR was always friendly as well in my opinion. I personally prefer getting my TN at land border crossings because they tend to take the "gather all the facts" approach vs. airports have a procedural approach that feels highly dependent on the agent you get. My most recent TN was I-129 which I think is a waste of money but if someone else is paying for it and you have the luxury of waiting in the US, then it's a seamless experience.