In my experience, there aren't a ton of differences.
Obviously, glass will permit more sunlight through which will make it more difficult to maintain a low temperature. However, if you keep it out of direct sunlight that shouldn't be an issue.
The only other thing that I've experienced is that glass top humidors have, shall we say, additional chances to fail since the glass itself has a seal where it's inlaid with the wood, instead of just where the lid is closing. This may cause some difficulties in holding humidity if the seals are imperfectly manufactured.
Aesthetically, I like glass tops because I like looking at my cigars
I've never had a problem with a glass top humidor, nor have I heard I higher number of complaints from that product, so if you like glass tops look over solid wood you go for it
Don't forget to give us a pic of whatever you get!