Wrong. Throttling is the wrong way to look at this. AMD and NV cards both cannot reach their maximum clock potential at stock settings. Buzz word here is "maximum clock potential". That is not throttling. NV doesn't throttle because they don't fall below the guaranteed base clock. AMD doesn't throttle because they ad the moniker "up to". It may seem like nitpicking, but it is important to understand these mechanisms.
NV: fixed base clock, everything above depends on thermals. Clock ceiling is dependent on ASIC quality (some Titans for example can go up to 993 MHz, others a bin higher to 1006).
Yeah, one of my Titans tops out at 980 while the other 1006 at stock. So the difference can be even higher. I have to set the clock offset to +21MHz for the slower one to match the clocks in SLI. The launch price is irrelevant for the Titan now it was certainly a very bad value but it still does not have a worthy successor. 20% more performance is in my opinion not enough to warrant upgrading in graphics cards I shoot for close to double the performance and never less than 50% more. No one will buy the Titan at its launch price, I bought one of my Titans for half the launch price a nice while ago.
It's just coincidence then that price is the glaringly obvious and massive downfall of the side you've chosen, right? I'm sure price is irrelevant to you when making purchasing decisions, or do other people buy your GPUs for you?
Technically, they are incredibly close in performance and one costs twice as much.
I don't know about you but I don't choose sides I buy PRODUCTS. I switch manufactures fairly often this is how my upgrade path looks like:
Voodoo, Voodoo2 (...something in between don't remember), 8500PRO, 9500PRO, X800XT, 9800GTO@GTX, 8800GTS 512, 4890, 5870, 5870sCF, 6970sCF, 6970QUAD, Titan(a downgrade actually), Titans SLI WCed