GT's animation was pretty decent most of the time, but just because it was newer doesn't mean it's better. I'm not a fan of how shiny and plastic everyone looks, and the actual animation seems slow and sluggish often. The scene where Goku, Pan and Trunks are walking towards Dr. Myu after Baby "dies" is just so awkward as they slowly walk towards him, talking about how "he's dead" and how "his plans are foiled" and whatnot. The fights lack much intensity as well, and just seem to move so slowly. I'm guessing that is partly due to bad storyboarding or something, but while GT looks pretty well drawn at times (despite worse than ever Last House animation), I think it's overall visually unimpressive.
In a nutshell, most of the time the actual drawings and animation was pretty good (despite a personal dislike for the shiny look), though hampered from, what I assume is poor storyboarding or something else, which makes for some awkward, slow moving scenes, and weaker looking fights. It may have possibly not been the fault of the animators, but GT never looked too good in motion to me most of the time.
Also, Studio Cockpit never worked on GT, so Z wins by default in the animation category.

Honestly though, I don't think GT
ever looked nearly as good as any episodes done by Studio Cockpit.
LeprikanGT wrote:GO watch the beam struggle between Cell and SS2 Gohan.
Yeah, that was done by Studio Cockpit. Their animation was among my favorite in the whole series. They unfortunately never worked on GT, and weren't around for the original Dragon Ball however...
Goku100xKamehameha wrote:Episode 121 of Z. The part where Trunks slices Mecha Freeza into bits is really awful.
Yeah, Studio Live's (triangle, not the other animator) art during the Freeza-arc looked horrendous, and stayed that way until around the Cell Games-arc.