For my first VS. Article I decided to do Bizarro vs. Venom.
The First Competitor Bizarro
He has been featured in: Challenge of the Super Friends (1978) voiced by Bill Calloway, Super Friends (1980–1982), The Super Powers Team: Galactic Guardians (1985–1986) voiced by Danny Dark, Superman: The Animated Series (1996–2000) voiced by Tim Daly, and Justice League Unlimited (2004–2006) voiced by George Newbern,Superboy (1988–1992) played by Barry Meyers, Smallville (2007),cut footage of Superman IV: The Quest for Peace (1987),and a Bizarro feature film is being developed by writers Dean Parisot and Robert Gordon.

POWERS:Bizarro is depicted as having all the abilities of Superman, although in some incarnations several of these traits have been reversed, such as "freeze vision" instead of heat vision, "flame breath" instead of freeze breath, "vacuum breath" instead of super breath, "microscopic vision" which makes objects 'actually smaller to everyone' rather than merely 'appear to be bigger to only the user'. This also applies to weaknesses, as Bizarro is vulnerable to blue kryptonite, as opposed to green kryptonite, which is lethal to Superman.
The Second Competitor Venom
He has been featured in: Spider-Man: The Animated Series, Spider-Man Unlimited, The Spectacular Spider-Man,The 2007 Spider Man 3 movie,and Avi Arad, producer and former Marvel Comics executive, plans to produce a Venom spin-off.
POWERS:Though it requires a living host in order to survive, the Venom Symbiote has been shown on some occasions to be able to fend for itself with its own set of unique powers. The Symbiote, even without a host, has shown shapeshifting abilities like forming spikes and expanding its size.
The Symbiote is telepathic and does not require physical contact to influence the minds of others. In Planet Of the Symbiotes, the creature, after being rejected by its host, emits a psychic scream which drives nearby humans to states of extreme depression. Later, with the assistance of Eddie Brock, it emits an even more powerful variant of that power which results in the mass suicide of an invasive force of Symbiotes. The Symbiote can also blend with any background, using an optic-camouflage type of effect, and shapeshift to resemble ordinary clothing. Venom is immune to the Penance Stare, an ability used by Ghost Rider, Johnny Blaze and Daniel Ketch. The Symbiote also augments the strength of its hosts.

The Symbiote originally rejected its species' habit of consuming its hosts, but in some interpretations it still required certain chemicals (human adrenaline) in order to survive. When starved of these chemicals, the Symbiote developed a mutable exoskeleton, allowing it to form its own solid body which it used to hunt and kill prey without the assistance of a host. However, because of Brock's, and later Gargan's, influence on its personality the Symbiote has developed a taste for blood, which both its hosts were forced to sate by physically devouring their victims. Later, the suit's evolution progressed and as shown in the 2003 Venom comic book series, its clone could spontaneously jump from host to host and after every departure said hosts would be left dead.
Because of its contact with Spider-Man, the Symbiote grants all of its subsequent hosts the hero's powers and cannot be detected by his spider-sense. As Spider-Man's fighting style is partly dependent on his spider-sense, his effectiveness was somewhat hampered when he battled Eddie Brock, allowing the less experienced Brock to keep up with him. However, the Symbiote is vulnerable to loud noises, such as the ringing of church bells.