SimuLord said:
Without a cheat code, the game would probably have been permanently shelved by now.
Most cheat codes are nothing more then crutches, never intended for more then debugging but used by players to defeat a game they couldn't otherwise beat without cheating. Making yourself invincible, the most used cheat, doesn't give anything to the game at all but reduce the challenge to zero.
While there are some people who have played a game through, like yourself, whom might experiment to see what other outcomes there could be in the game and look for Easter eggs they are not the majority. For every one of us, I've done this too, there are many others who are using the same cheat codes so they can beat a game they wouldn't otherwise been able to defeat. They have no interest in asking the 'what if' they just need to feel special by defeating a game and can not rationalise that they are not the ones doing it: The cheat codes are. Same reason we find these losers in online play so much, as disgusting as that is.
When you ask the question what cheat code is best, it is this majority which will have the loudest voice. I'm not saying that all people here, a gaming site, would be using the cheats in such a way but I can bet safely that a large chunk would of at some time in their lives. Cheat codes are mostly used for that purpose, not the Easter egg hunting what if crowd.
We get a form of cheat codes, I don't consider them cheats myself, which do wacky things. Those are far more fun! These add a different element to the game, even if just a humorous one most times, and hence should be rated as the best. Instead, look through this list, and you will find it is the most common crutch based cheats which are being put forth as 'best.'
I was trying to highlight that the best cheat codes are those which do not detract from the game what so ever. This means most of the cheat codes mentioned here are on my list of 'worse' not best. Not denouncing you for cheating to see what will happen, but just realise that most people don't cheat for any other reason to beat something they couldn't otherwise beat on their own.