In Mega Man Zero 2, X's body is destroyed by the antagonistic Elpizo, but his mind remains active until he fades away in Mega Man Zero 3 after protecting Zero from the enemy Omega.

megaman and X are two different people... X is an entirely different robot Dr. Light began creating around the time of Megaman 7-8 (Assuming he was made at the same time as Zero).

Ultimately, the difference between X and Samus is abundantly clear. While Metroid's prime bounty hunter was no slouch and didn't go down without a fight, X's greater power, versatility, Ultimate Armor, and regenerative ability earned him a hard fought victory.

As a woman in a male-dominated role, Samus has been widely considered a breakthrough for female characters in video games, and is one of the most beloved video game characters of all time by critics and fans alike. Samus is one of the first major female protagonists in a video game.