Cotopaxi Allpa 42L vs Osprey Fairview 40/55L vs Osprey Daylite 44L vs Patagonia Black Hole vs Thule Landmark

Trying to decide between these backpacks, but open to other suggestions as well. going to be traveling for a few months. only considering packs that open fully like a suitcase. Would love to hear peoples opinions if they have any of these! TIA.