Not really. 3PDT's used to be very expensive and hard to find. Now they're dirt cheap and easily available. A 2PDT plus the Millenium circuit will probably cost more than a 3PDT, but that may depend on where you live. It won't be long before they're considered mojo.
The only noticeable differences I've found between the two options are :
1. The X-wing DPDT's have a noticeably lighter action threshold (it takes less pressure to switch them). It felt surprisingly different the first time I used one, but was very easy to get used to. Now it feels kind of luxurious. (Seriously.)
2. The X-wings are also easier to melt in my experience. You should go very easy on the soldering time for both of them, though. (Don't hold the soldering iron to a lug for more than 1 second at a time, and let them cool down before you try again.)
/$0.02