What criteria are most important when shopping for a light box?

I am a media arts student in need of a light box for my supply kit. The supply list reads, “Light Box (for 2D animation)” and offers no other specifications, but I’ve found that light boxes vary greatly in terms of cost, dimensions, number of bulbs, wattage of bulbs, degree that work surface tilts, etc. Thin-panel light boxes seem more convenient to transport and store, but they are also much less expensive than standard light boxes, which makes me question their functionality.

Any current art students (or practicing artists, art teachers, art supply enthusiasts, etc.) with knowledge on the subject?