whatever weapon you like using more is the answer. hunting elk, both are difficult, but the difficulties are completely different with each weapon.
I certainly feel like you'll have more fun archery season, but i'm bias in that regard. tough to say without knowing your exact goals and expectations, but tough to go wrong archery hunting if you have already done enough of it for other species. you'll probably have a good deal more action with a bow, but probably a higher chance of capitalizing on encounters with a rifle.
I wouldn't say one is easier than the other in terms of filling tags if you shoot both weapons well