As you guys know, I have started a Sonic Franchise rewritten story, so I thought that you guys would like to see what timeline I have in mind. If you have any questions, you can always PM me. Also, note that this is a rewritten story so if there are plotholes in the order I have shared, it is likely that I will address them.
-Sonic Underground EP 1
-Sonic the Comic origin + Sonic 1 Genesis/MS
-A Blast to the Past (Satam past POV)
-Segasonic the Hedgehog
-Sonic X (flashback)
-Adventures of Sonic the Hedgehog Ep 1
-Dr. Robotnik Mean Bean Machine
-AOSTH Ep 2 - 21 (exempt 16)
-Sonic Chaos
-Sonic Triple Trouble
-Sonic 2 Genesis/MS
-Sonic 3 & Knuckles
-AOSTH Ep 22 - 33
-Segasonic Cosmo FIghter
-AOSTH Ep 16
-Tails Skypatrol
-Tails Adventure
-Sonic Labyrinth
-Sonic CD
-AOSTH Ep 34 - 40
-Knuckles Chaotix
-Sonic Spinball (AOSTH Ep 41)
-AOSTH Christmas Blast
-Sonic OVA
-AOSTH Ep 42 - 60
-Sonic the Fighters
-AOSTH Ep 61 - 65
-Sonic Blast
-Sonic 3D Blast
-Sonic R
-Sonic Pocket Adventure
-Sonic Advance
-Sonic Advance 2
-Sonic Shuffle
-Sonic 4
-Sonic X season 1
-Sonic Adventure
-Sonic Adventure 2
-Sonic X (Leapster)
-Sonic X season 2 (ep 14-26 exempt 19 & 20)
-Sonic X season 3
-Sonic Pinball Party
-Sonic Heroes
-Shadow the Hedgehog (not really but you'll see :p)
-Sonic Battle
-Sonic Advance 3
-Sonic Rush + Rush Adventure
-Sonic the Hedgehog (2006)
-Sonic Riders + Riders Zero Gravity
-Sonic Satam
-Sonic Underground
-Sonic and the Secret Rings
-Sonic Rivals
-Sonic Rivals 2
-Sonic Unleashed (Sonic and Knuckles: World Adventure) (360 + Wii)
-Sonic and the Black Knight
-Sonic Free Riders
-Sonic Colors (wii + Ds)
-Sonic Generations (HD + 3DS) (Sonic Genesis comic)
-Sonic Lost World (Wii U)
-Sonic Runners Adventure
-Sonic Chronicles: Dark Brotherhood
-Sonic Mania Plus
-Sonic Forces
-Sonic IDW
other contents are in different timelines
Ie Sonic 2020 movie with Waku Waku patrol car
Another timeline would be the Sonic Boom timeline