Anime wise, Pokemon came out first in both the US and Japan. Game wise, in Japan, Digimon's games are older.
Anyway, I was in my late teens when Digimon started here. I liked it. I prefer the original more so, though, to the dub. My least favorite is Digimon Frontier. I liked Digimon Savers okay (which just started airing in the states). Digimon Tamers is the only seriers I haven't seen all the way through, although, balance wise, it's the best out of all of them.
That aside, Digimon is definitely not a rip off of Pokemon and anyone's who's watched both shows should be able to tell that. Pokemon is a show about becoming the world's best trainer, while Digimon, usually, is about saving the world or keeping it safe from enemies, or some government conspiracy related stuff (like Digimon Savers and to a smaller extend, Digimon Tamers). The only similarity both series have is that both deal with monsters. Digimon's human characters also have more depth to them compared to Pokemon, where the characters seem to remain completely stoic. No growth and such what-so-ever. Satoshi, a better trainer I'm sure now, is still pretty much the same.
It's just as bad as people saying Cardcaptor Sakura is a rip-offof Yugioh and vice-versa, when both series are way too different, the only similarity being that they both deal with cards.
HarryReems
That show was doo-doo.
A poorly animated Pokemon ripoff with REALLY horrible character designs.
I could do without all those "collect-em-all and get stronger" shows.
Shows you've never watched it if you believe that...
erikko
for me it's a lame spin-off of Pokemon
Even though game wise, Digimon technically was out first? Wouldn't Pokemon be the spin-off? =P