My max hit with a whip is 29. My max hit with a godsword (no special) is 42 according to a calculator (never actually hit 42). Now, a whip is twice as fast as a godsword. This answers the question of which is better for experience and damage dealt: i could potentially hit a 58 with my whip in the time it takes to hit a max of 42 with a godsword. Also, as has been said before, a whip is obviously much more affordable. However, if you want to train strength, the godsword is easily superior. In addition, godswords are invaluable for bounty hunter (obviously not at the moment) and PvP. Another example of godswords being superior is with barrows, especially the SGS. With its special, the SGS cuts down greatly on costs, and affords multiple trips without banking. Last but not least, the godsword looks awesome, and let's face it: people buy things for looks, otherwise a dragon chain would be worth dirt and bandos chestplates would drop considerably as people favor fighter torsos. All in all, it is hard to say which is better; they both have pros and cons. I personally use a godsword for strength training and a whip for all else.