An obvious advantage of the stainless steel Atmos is durability. You can drop this sucker and it won't shatter. A less obvious advantage is protection from harmful UV rays. This might be something to consider if your kitchen countertop is near a window and sunlight constantly shines through.
An obvious advantage of the clear glass Atmos is price. It is cheaper than the stainless steel option. Another advantage is transparency. If you'd like to put your coffee beans on display, the glass canister would suit your needs better.