Both sides’ recent form is great, but Canada are more famous, because Martinique is not a FIFA member. Besides, they failed to make into the knock-out stage in the last two editions of Gold Cup.
On the other hand, Canada made into the quarter-finals of Gold Cup last time. However, you can never count Martinique out who beat Canada with 1-0 in Gold Cup back in 2013. Moreover, the AH line decreased from -1.25 to -1.00 for Canada, which is in favor of Martinique.
Therefore Martinique should be supported in AH.