The DualShock 3 is lighter and has a built-in battery. But the weight of the Xbox controller falls on one until you've played for a while with him and then takes the Sony controller in his hand for a while. ;)
The weight is not an issue for me, I feel neither the one nor the other as too heavy. The supposed advantage of the built-in battery in the PS3 controller is also its biggest drawback. It makes for a higher price and when times back ... Well then it is well before the election: new controller or somehow replace (leave). The Sony battery but has a decent life - even if he loses power relatively quickly in my opinion, even if it is not used (self-discharge).
The Microsoft controller is in my opinion better in the hand and even my friend who has significantly smaller hands, perceives it as pleasant. Overall, he's just more ergonomic. The whole design is not as "repellent" as the DualShock. The trigger buttons are shaped like a hood - a slip so impossible under normal circumstances. Not so with the DualShock - here you can slip quite. The same applies to the two analog sticks.
Combining the Xbox 360 Controller or with the Sanyo Eneloops one misses anything - very long runtime on a single charge and an extremely low self-discharge. The enclosed batteries last forever (after 1 month almost daily games after hours and / or during the weekend, the display shows still full power on).
Conclusion: Even if the 35, current - must pay for it, so it is worth buying. I had rather bad Erfahrunge been made for all consoles with the accessories of third-party and in this case the price Scheid's not even that big. So - you! ;)