What causes you to think that? The charts I use have the S&P500 blowing Gold out of the water over a 100 year period on share to one ounce even after the latest crash:
If you have other charts I'd be interested in seeing them. I've always wanted to invest in gold but performance wise all of the data I have show it to be a lack luster investment over time.
I think I should not determine which site is exactly the best. As with any assets, for the safety of their funds it is worth diversifying them both in different assets and in different platforms. At the very least, I personally consider it necessary.