Ok, so I said I would show my opinions on the cartoons and anime and here it is. This is all based on MY opinion, so don't hate me for loving or hating it.
Adventures of Sonic the Hedgehog
The first Sonic cartoon, and it was great. Also know as AoStH, this show was loosely based on the Sonic games, only funnier! It's about Sonic and Tails trying to stop Ivo Robotnik from taking over Mobius with the help of his badniks Scratch, Grounder, and Coconuts.I like funny stuff, so this show was really entertaining. One thing I really liked is how they put the Sonic 1 and 2 main theme song as the show's them song, only without the 16-bit sounds. THough the show is great, i can't help but thing AoStH Robotnik literally looks like a dickhead and the infamous "PINGAS" jokes don't help his reputation at all. He's a complete joke in this show, but you got love him and his clownish personality! Anyways, I love this show, and I especially love the crapload of Youtube Poops this show has! Here's a link for a really funny one [link]
Sonic the Hedgehog
Also known best as SatAM, this show went independent with its story as it had a darker take on Sonic's world. It once again takes place on Mobius, but it has been conquered by Julian Robotnik(not Ivo this time) and is now run by him and his Swatbots. It's about Sonic and the Freedom Fighters trying to free Mobotropolis(now Robotropolis since Robotnik's takeover) and find their families. All I can say is, THIS IS FUCKING AWESOME! The show is simply great! The theme song "The Fastest Thing Alive" is awesome though not quite as good as the music I listed in my Sonic music entry, it's pretty great music. They have Sonic and the other characters all planned out and well-developed, the setting looks great with the Freedom Fighters living in a nice looking forest while Robotnik and his Swatbots live and patrol a city full of metallic nightmares! This show has the most evil version of Robotnik, though he is too overrated in my opinion because he doesn't act like the scientist he should be. Instead he's a plain dictator who stole the Roboticizer from Sonic's uncle Chuck, which is kinda dissapointing because it would have been great if Robotnik actually created it himself. Anyhow, the show was defeated by Power Rangers and a season 3 was never created which is really sad, cuz it ended in a big, huge cliffhanger......
Ummmm, it's kinda bad in my opinion because...........well..........MAGIC INSTRUMENTS!?! Compared to SatAM, this was trash because apparently Sonic is a prince who was abandoned by his mother(along with his siblings, Sonia and Manik) after Robotnik takes over Mobius. The theme song though it is ok, is not as good as "The Fastest Thing Alive". I really don't like Manik and Sonia's presence, they kinda annoy me. Also, they have the wierd concept of having necklaces which can apparently fit an entire instrument inside. Sonic and Sonia are equipped with guitars that can shoot lasers while Manic is equipped with a drumset which can cause earthquakes. I don't know why, but I think this concept is just plain wierd and the show itself isn't as good as SatAM. The show was eventually canceled like SatAM but I didn't really care. I also heard this show airs on Disney XD, if it really did, I'm really disappointed.
HOLY CRAP! This is amazing! Also known as Sonic the Movie, it's a two episode series which has Sonic and Tails living on Planet Freedom in the land of the sky. Robotnik(Eggman in Japan) is cast out of the land of the darkness by Metal Robotnik(Black Eggman in Japan) and calls Sonic and Tails for help because the generator that powers his base is about to overheat and explode, taking the planet with it. It's a really good anime, Sonic has that sassy attitude he's had in the DIC cartoons, Tails is finally the sidekick he should be(he was kinda useless in all the DIC cartoons), Knuckles(who now wears a hat) makes an appearance and tags along with Sonic and Tails, and Robotnik no longer looks like a dickhead! YAY! The voice acting is great, I just love the music, and the concept of Metal Robotnik is something I'd like to see in the games! Overall, I love this anime, it's my favorite Sonic anime/cartoon and I really wish it became a full series but it shared the same fate as SatAM and Underground.
The latest Sonic anime and it's ok. I'm not talking about the crappy ass 4kids American version, I'm talking about the original Japanese version. It's a step back compared to Sonic OVA but it's alright. It's not good or amazing, most particularly because of Sonic's friend, Chris. The anime has Sonic living on a parallel version of Earth(NOT MOBIUS) trying to save Cream from Robotnik(who once again has no dickhead, lol) until he uses Chaos Control(or was it something else?) which teleports him and his friends to presumably, OUR Earth. It's loosley based on both Sonic Adventure and Sonic Adventure 2 as well as Sonic Battle and Sonic Heroes. Now why this show isn't good is because most of it is about Chris. It doesn't feel like it's about Sonic, most of the show points at Chris and even when Sonic and friends return to parallel Earth, Chris still manages to ruin it by visiting their planet. Again, it's okay, but I really hate Chris just as much as I do Sonia and Manik. This is the second Sonic show to actually be FINISHED unlike SatAM, Underground and the OVA.