The actual peak of 3D Sonic sadly does not exist on Nintendo hardware and that's the 360/PS3 versions of Unleashed and Generations. There's been several games that have come close, the Wii version of Unleashed as well as Colors and Forces, but all of those games have limitations to the boost or level design that hold them back from demonstrating the pure speed and exhilaration of boost gameplay. I hope someday the definitive editions of those two masterpieces will grace a Nintendo console.