Here is a good review that can maybe answer your questions.
It used the X3 435, not the X3 440. But you should be able to get a good impression about gaming and productivity comparison. Clarkdale Review: Intel's Core i5 661, i3 540 & i3 530 @ AnanadTech
Both CPUs would make a great system. We like the X3 435/440 for it's overall build cost.
For a whole system look over at the Homebuilt Systems forum topic Recommended Builds by Usage
They have suggested x3 435 and i3 530 options.