請教登陸加拿大 with AP

我最近剛用AP從中國返美,二月之前必須去加拿大登陸. 我的H1B 還有效, 請問

which way is better in terms of 登陸和回美的難易, fly to Seattle then drive aross border or Fly to Vancouver directly? Some people told me the officers at the airport are more professional while some tols me that it would be easier to get landing at the border. If I take airplane, can I ask them to keep I94?

Thank you so much!