Back to the value. It is supply and demand. There is a ton of 996 cars out there and nobody wants them right now. If you think they are as good or better than the 993, you should go for it.
My prediction for the future value of 993s is that they will be holding their dollar value (possibly not making up for inflation) and that 996s will eventually be found in the 928 price range, the basement. They will be worse than the 964.
One big killer for the 996 which we have not mentioned here is the fact that it looks like a Boxster from the front. It especially takes a second look if you have a cabriolet. Nobody wants to buy the "supercar" to be potentially mistaken for it's cheap mini me.
And yes, a lot of this is about emotions, down to the shape of headlights. Nobody buys a certain 911 because they need it or not even for the differences in performance.
There are some opinions in this thread that are outside of the mainstream of 911 enthusiasts. That's respectable. But in the end this is a value discussion. And the direction the herd is going (993) is the direction the money is going as well. For everyone else, I suggest you buy two 996s, while they are cheap.
George