Shannon, I sailed the Inspiration twice, once when it was new and then about a year or so later. At that time it as doing 7 day cruises out of San Juan. The Inspiration was built in 1996 and is registered at 70,376 tons, by no means a small ship.
The Glory is a 110,000 ton ship, a little larger than the Pride and her sister ships, the Spirit and the Legend, which are at 88,500 tons each. The Glory is sister to the Carnival Conquest.
After your sailing on the Pride, as it was a new ship, you possibly may be a little disappointed in the Inspiration. You can look in the Carnival brochure at the layout for Conquest ---the layout for the Glory is exactly the same. Then check the Inspiration and this will give you a good idea of the design and layout of the two ships.
I saw the Inspiration the other day in Tampa and she looked great, but I was only looking from the outside. Check both out and if the itinerary on one is better for you, then go with that. You will have a great time no matter which you choose, as it's hard to have a bad cruise !!