An obvious advantage of the stainless steel Atmos is durability. You can drop them and they 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.
The clear glass Atmos is less expensive than the stainless steel option and if you'd like to put your coffee beans on display, the glass canister would suit your needs better.