Saturn had more 3rd party support than the Dreamcast, especially when you consider that Sega actually lost EA support during the DC era. That was a pretty big loss for them.

And the best EA game on Saturn is one of the best games of that era in a genre. Sōkyūgurentai aka Terra Diver.

GameCube had

Resident Evil 4, Resident Evil 0, Resident Evil REMake, Metal Gear Solid: The Twin Snakes, Tales of Symphonia, Star Wars: Rogue Squadron 2 & 3, Soul Calibur 2, SSX Tricky, Prince of Persia, The Matrix, Sonic Adventure 1/2, Skies of Arcadia, Phantasy Star Online, NBA Street 2, TimeSplitters: Future Perfect, Viewtiful Joe 1/2, 007: Nightfire, Lord of the Rings: Return of the King, Super Monkey Ball, Medal of Honor, Spider-Man 2, Crazy Taxi, Call of Duty, Medal of Honor, Madden NFL, NHL, NBA 2K, X-Men Legends, Tony Hawk Pro Skater 4, Killer 7, Final Fantasy: Crystal Chronicles, Beyond Good & Evil, Simpsons Hit & Run, 007: From Russia with Love ... that probably bests the Saturn and Dreamcast I think. 

Dreamcast just didn't have long enough of a life cycle.

Yeah as much as the Gamecube isn't my cup of tea, it did have one of the stronger third party lineups for a Nintendo console post-SNES, and for a system with relatively low sales.

Saturn is handicapped a little by so many of its third party titles not seeing worldwide release, which is a shame, but it did still boast the likes of Resident Evil, Tomb Raider, Castlevania Symphony of the Night, Powerslave, Quake, Doom, etc, considerably beating out the N64 in this regard despite selling less than a third as many consoles.

I will throw in Neo Geo CD. I say CD since AES was meant as a niche device and was supported from 1990 well into the PS2 era. CD was mostly ports of AES games but on CD. Why do this? CD's were cheaper than the 200-$300 carts. It did have poor load times but then they released the Neo Geo CDZ witch improved load times.

Once you hit the 30 million consoles sold mark you no longer can be called unsuccessful.  The Atari 2600 was the first successful console, and it barely hit the 30 million units sold mark.  Heck once you hit the 20 million mark you hit the semi successful mark.  You can also sell under 20 million and be semi successful since the Saturn and PC Engine were successful in Japan but not very successful anywhere else. 

Since it barely got supported for 2 years, I think the Dreamcast wins this one if it would have sold even a bit more it would have gotten a lot more games.