In Halo: Fall of the Reach there are some of master cheif's partners, example of Fred-104, Will-043 and Linda-058. One of these characters could have been stronger then master cheif.Besides that, Halo Wars the game also had a spartan team, so nobody knows, But I will always vote for MC.
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Master Chief is not in Halo Wars. However, there are three main Spartan IIs in Halo Wars and Spartan IIs who are unnamed that you can train for your army.
The Master Chief is a Spartan II. All of the Spartans from Halo: Reach (excluding Jorge) are Spartan III's. Also, there is no such thing as a Spartan I in the Halo universe. They were called ORION soldiers. After the ORION Project failed, Dr. Halsey made modifications to it and renamed the Spartan II Project.
The main Character is Master Chief Spartan 117, although the Aribter is very important
In halo 1,2, and 3, the only spartan there is is master chief, or John 117. In halo reach there are still a group of Spartans left, until the end when they all die.
In Halo 3, you play as the Master Chief, the last surviving super-soldier of the Spartan II group. In Halo 3: ODST, you play as an ODST instead of the Master Chief. There are also different weapons in ODST.