The Vivexotic mentions the "toughened glass", this is the stuff you use when there's a reasonable chance of your face going through it. It's stronger for its thickness compared to plate glass and it shatters if broken which is much safer if you break it with your face. This is the stuff they'll use on doors to your home, but not on your typically sized window in a home. Unless you plan on doing some gymnastics near your vivarium, the plate glass in the exoterra is just fine. I think Vivexotic over-emphasizes how awesome it is for this application, but this is from the point of view of someone who is old enough to know better than to play football (soccer) in his livingroom.

The vents in the Vivexotic seem small, they say they provide "optimum temperature and humidity levels", but don't mention for what critter. I'd want to know what they consider "optimum" and if you'll need to do any adjustments. Treefrogs need lots of ventilation, I suppose you can always add little fans to improve this if necessary. Not properly sealing the ends of the wood in the Vivexotic will lead to an ugly disaster in time. Assuming you can work with these potential difficulties, I don't see any other problems with these. I'd take the 3" drop in height for the drastic increase in size for the dimensions you are considering. One of the taller options would be better though. You might want to find some people who have used Vivexotic vivariums for a few years to see how they've held up.

Good luck! I have 3 gray treefrogs myself, and they're pretty awesome- the loudness of the male calling would be my only concern if you had thin walls and sensitive neighbours..