Glass has the advantage of being transparent so one doesn't have to open the humi to pick a cigar to smoke. OTOH, humi glass typically doesn't have much value as an insulator against temperature swings (which will be irrelevant to some).

I have a small countertop glass display humi. With the hydra and a couple pounds of beads and sealing it recovers RH from door openings fairly quickly. However, the display humi has to go the basement in summer because I don't have air conditioning.

FYI, the hygro's that pet stores sell for lizard/amphibean terrariums are pretty much the same thing inside and can be much less expensive. The only difference is usually the size of the holes in the hygro case (bigger holes in cigar-marketed hygro's give faster response).