Wing Gundam XXXG-01W
This Gundam (which I think is the cliche one that the producers add for average fans to love) is piloted by Heero Yuy. It can turn into "Bird Mode" and fly as an aircraft. Its buster rifle is extremely powerful, and it was created by Dr. J, in the L1 Colony cluster. It is later replaced by the Wing Gundam Zero (different Gundam, but same layout), and then the Wing Gundam Zero Custom.
Gundam Deathscythe XXXG-01D
This Gundam was built for stealth. It has a pair of Hyper Jammers which do pretty much that. It carries a Beam Scythe, which is a truly cool weapon. It was created by the Sweeper Group on the L2 Colony cluster. This Gundam takes no crap from anyone! (by the way, even though I named myself after it, it is not my favorite Gundam, it just sounds the coolest)! Later on it is replaced by the sinister Deathscythe Hell and then the Deathscythe Hell Custom.
Gundam Heavyarms XXXG-01H
This is one kick-ass Gundam that destroys all in its path. It is loaded with weaponry, and can destroy alot with sheer force. It lacks in fighting in speed, but that doesn't matter, because it can remain stationary and kill things from long-distance. It was built by the resistence force in the L3 Colony cluster, and its pilot, Trowa, really knows how to use it! When it runs out of bullets and missiles, it just deploys the awesome army knife which can slice through a surprising amount, for just a back up weapon! Later on Heavyarms Kai, and Heavyarms Custom come to take its place.
Gundam Sandrock XXXG-01SR
I find this Gundam to be quite useless. It has awesome Heat Shotels, but it lacks in long range, and it has a weak pilot. It usually does poorly in battle, unless assisted by the overly cool Maganac Force or the other Gundams. But it does look cool. It was created using the Winner family's resources, in the L4 Colony cluster. After it is destroyed though, Sandrock Kai, and Sandrock Custom take its spot.
Shenlong Gundam XXXG-01S
This Gundam is sweet! Its claws crush all, its glaives slice all, and its flamethrower burns all! It takes no prisoners. It was made by the L5 Colony cluster resistence force, and is piloted by the highly honorable Wufei. He refers to it as "Nataku." This Gundam gets even cooler, when Altron and Altron Custom emerge in its place.
Tallgeese OZ-00MS
This isn't a Gundam, this is an old suit, that the Gundams and the Leo suits were modeled after. OZ rebuilds it for Zechs, and the results are great. He is successful in mastering the Tallgeese and fights the Gundams in it. He puts up a good fight. Later on the Tallgeese II is built for Treize Kushrenada, and then after that, the Tallgeese III is built for Zechs.
Gundam Epyon OZ-13MS
This isn't a Gundam in my eyes. It was built by Treize and given to Heero. Later him and Zechs fought, and traded suits. This dude looks cool, like a dragon really, and also has a "Bird(-like) Mode." Seeing by the statistics, you can tell it is the best, but Heero and Zechs always fight with equal skill. In the end, it is blown up in Libra, to all of our dismay.