Best angle for a Canadian stem?

[hiplainsdrifter]

One of my Canadians has a perfectly straight stem, the other is slightly upswept. I am having trouble deciding which is easier on the teeth. Other opinions?

 

[nsfisher]

I don't care for the "Upsweep" stems, so I will go with the straight stem.

 

[marmal4de]

Straight and true every time.