Because general opinion on Bowser is that he has more options/opportunities to win than Mewtwo does.
How? By struggling to catch the opponent? Boozer players have one thing in common with us and that's the reliance on mindgames. But more on that further down...
Likewise, the general opinion of Mewtwo is still stuck in the "worst character in the game" mindset, people don't think very highly of him.
Yeah... I get that a lot too. Mewtwo's too awkward for most people to get a grip on what he can do before they give up.
I think it's very absurd, Bowser gets combo'd alot easier than Mewtwo does, and that Mewtwo has a better moveset, but I'm a Mewtwo main, so I'm of course biased.
Okay. So I'm going to try to be unbiased here and list Bowser and Mewtwo's strong points/weak points.
Bowser.
Pros
*Decent range and large hitboxes
*Good knockback on most of his attacks
*Has good edgeguarding
*Heaviest character in the game and extremely hard to KO.
*Has some good options on ledge
*Has a very fast and useful Up+B attack
*Has the strongest forward smash in game
*Has good range with Smash-B
*By far the largest shield size in the game.
*Good horizantal recovery.
*Smash-B can grab opponents and throw with 1.3 times normal throw power, or can slash at opponents, throwing them into the air
*Has very good strength and durability
*Has a great SHFFL game.
Cons
*A very large target with a very high "duck".
*One of, if not the easiest character to combo in the game.
*Almost all of his attacks have a lot of start up/ finish lag, making it easy to combo Bowser after a single wiffed attack.
*Has almost no combos. The few combos he has are on 3 characters, are not guaranteed (they can be escaped with proper DI), and are generally only 2 hit combos.
*Possesses a very slow and near useless wavedash (except when used as a waveland)
*Awful standing grab range (resulting in a terrible shield grab).
*Fairly slow dash speed compared to most characters
*A lot of his KOs are dependent on his ability to edgeguard opponents, which means they must first be off the edge.
*Possesses a very slow jumping and landing animation which is one of, if not the major reason he is so slow
Mewtwo.
*Fastest and longest backward and forward roll in the game
*2nd longest recovery in the game, both vertically and hoizantally
*Throws that can combo and kill, especially his Up-Throw
*Powerful projectile
*3rd longest wavedash in the game
*Fast tilts with combo capacity
*Powerful F-air with combo and killing potential.
*Can edge guard faraway opponents by jumping off the ledge because its long recovery ensures a safe return
*Air dodging turns Mewtwo invisible, making it impossible to tell which direction it is going in
*Up-B special (Teleport) is an excellent recovery attack, due to its decent range and ability to pass through any attack
*Can moonwalk
*Has a meteor smash
*Can reflect incoming projectiles (Confusion.)
*DJC'ing Mewtwo's airs allows for fast offensive/defensive options if used smartly.
*Although d-smash doesn't hit both sides, u-smash does.
Cons
*Very big target easily KO'ed due to its light weight and floatiness
*Floatiness causes poor traction
*Exceedingly poor approach, due to lack of fast defensive options
*Poor spot dodge
*Forward throw does little damage and has minimal knockback
*Has a very slow dash
*Down smash is the only down smash in the game to only hit on one side
*Projectiles reflected with Confusion will NOT harm the opponent that sent the attack.
*Confusion sometimes leaves Mewtwo open for an attack from the opponent he uses it on.
*Highest crouch in the game. Therefore, Mewtwo cannot duck under many attacks.
Copy/pasted from the wiki. I edited a few of them and added one or two for Bowser. The real question is... Does Bowser's superior power and K.O. ability trump Mewtwo's projectile, faster dash speed, far longer Wavedash, vastly superior recovery, and a far better combo potential?
I don't think so personally, but I wonder what the experts opinions are??
Gimpy, what are your thoughts?
Yeah, let's get the Bowser master in on this!