Resting upright puts a pillow in a very different position from sleeping flat. The Snugpak Butterfly Neck Pillow WGTE is a neck-pillow option, so I'd judge how it supports a seated person before comparing it with a rectangular camping pillow.

The product description calls it self-inflating. That can make the setup more straightforward, but the shape and final firmness still have to work with the person using it.

What to Compare First

Butterfly neck-pillow design.
Self-inflating format.
Camp and travel role.

Try it with the actual seat or resting position if possible. A pillow can feel supportive for a few minutes and interfere with a headrest once you're in a vehicle. Neckwear and a hood can also change the amount of room you need.

Self-Inflation Doesn't Pick Your Firmness

Read the valve instructions and learn how the pillow reaches its intended shape. Some self-inflating products still allow adjustment, but I'd check this exact model rather than assume the routine from another pillow.

Also consider repacking. A travel accessory needs to be easy to put away when a stop ends, particularly if you're managing luggage and outerwear at the same time. Find out the packed dimensions before allocating a permanent space in a small bag.

Who I'd Compare It For

The Butterfly makes sense to consider for someone whose discomfort comes from a seated-rest position. If you mainly sleep flat in a tent, compare whether its neck-focused shape is actually more useful than a conventional pillow.

I wouldn't buy any pillow based on the shape name alone. Comfort is personal, and an attractive compact package doesn't prove the support is right for you. The useful feature here is a dedicated travel shape, provided it suits your seat, headrest, and preferred resting position.