Namco Bandai's sport compilation features 7 "unique sports mini-games" and appears to lack its own personality, while Hudson's collection has 10 sports and more appealing visuals. So the odds already seem to be in favour of Deca Sports Extreme.
On that note, if you were to compare the visuals here to those seen in the original Deca Sports, you'll notice that they look much better (read: less simplistic). Every screen I've seen of the game has some sort of special effect going on, which is a good sign. I'm curious to find out if they'll take to the online servers for multiplayer support once again, but not much has been said about that. The official release date also hasn't been confirmed yet, so I'm pretty sure Konami will announce that this week. All in all, though, Deca Sports Extreme isn't looking too shabby so far. Hopefully this will be the title that pulls the series out of the gutter.