KenHamer Put me on to DL when I was frustrated with AC. I know maintain SE with AC and Gold with DL. My upgrade record with both is the same. Not a lot of medallion members in Canada and flights to/from the US are a breeze with UDU. Within the US ... not so much.
Premium class fares to places outside North America are much much better. For personal trips I like to sit up front. And with a Nexus, I do not mind connecting through the US.
If you want lounge access, get a CC which gives you some. My wife has one that gives her 4 per year. It is all she needs.