A fleece-lined internal pocket is the best option if you regularly carry spare goggles or like to take yours off during lunch breaks on the mountain. The soft fleece lining prevents lens scratches—something that can easily happen if you toss goggles loosely into the main compartment with tools, snacks, or other gear.
The internal placement keeps your goggles more secure and protected from bumps than an external pocket would. It's tucked inside the top lid or front panel, so they won't fall out if you're moving around or taking a spill.
The trade-off is that it takes up space inside your pack. If you're using a smaller backpack (say 15–20L for resort skiing), that internal volume matters more than on a larger touring pack. Also, if you're someone who almost never removes their goggles from your helmet, this feature may not be worth prioritizing—you'd be paying for storage you rarely use.