No.
If you're trying to decide between pulling the power cord and holding the power button down for 8 seconds, hold the button down. Pulling the plug could introduce surges or spikes immediately preceding the actual power loss, while holding the button does not do this.
If for any reason your system is not responding and needs to be shut down quickly, hold the button.
The only case where you ought to pull the plug rather than wait the 8 seconds while holding the button down is if you've spilled something liquid on the system where the risk of electrical short causing significant damage is greater than the risk of problems caused by pulling the plug.