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If the difference between them is $450, then for the PC to reach the total cost of the laptop ($900), 25 years would have o pass. ($450{difference} / $18{elec. per year}) = 25 years. Also if something in your laptop breaks, you will probably have to change the whole motherboard, which will not be much less than the total price of the laptop. Also if you want to upgrade only one part of the PC you can, for example the graphic card, while in a laptop you cant, since it is permanently attached to the laptop motherboard. Also if you buy a PC and a laptop for the same price, the PC will be much better. In my opinion: DEFINITELY go for the desktop. Unless you really need something to carry around with you

Advantages

Portability: The number one reason why people buy laptops is because they can take it anywhere. If you constantly have to go on trips, a laptop will be very useful. Your own laptop will have all your e-mail, software’s, presentations, sales material etc. You can store all of this and much more information that you constantly need, on your laptop without any problems.

Size and Weight: Laptops are compact. The single laptop contains, your monitor, CPU, speakers, keyboard, mouse and everything else a normal computer contains. If you do not have place at home or have little space on your office desk. If your situation is such that you do not have space to accommodate another computer, then it would be good to go in for laptop.

Un-interrupted power supply: In India, once in a while the electricity still does fail. A laptop is kind of a desktop computer and a in-built UPS. It can be charged with battery and it will stay on so long as the battery has charge. So, if you act wisely, and keep your laptop charged, you will never have the problem on not being able to work on your laptop because the lights have gone.

Image: Firstly, laptops are cool! But that not a good enough reason. A laptop also gives credibility. If you go for a presentation with your laptop, then that gives a good impression to the other party. So, if you are trying to convince people that you are a big player and it is worth dealing with you, presentations given on laptops might help you a little.

Disadvantages

Technology: Because a laptop is pretty compact, some of the recent technology that's been developed for desktops has yet to be made into thinner and smaller forms and successfully fitted into laptops. So laptops are always a step behind desktops when it comes to capability and efficiency. However, the laptop market is growing and this situation is fast changing.

Comfort: You will have to get used to using a mouse pad instead of a mouse. Your keyboard and your monitor are connected, so when you type your face will close to the monitor. You will not get “sub-woofer” quality sound, unless you externally connect your laptop to a sub-woofer.

Upgrading (forget about it): If you're planning on adding stuff onto your computer, get yourself a desktop and not a laptop. Upgrading a laptop is not impossible. But, anybody who knows anything about computers will tell you that it's impractical to purchase a laptop with the intention of upgrading it. It's often impossible to add stuff like RAM and hard drives without sending the entire piece back to the manufacturer. Even if you do decide to upgrade, you are limited in the selection of extra equipment; most laptops require you to install parts manufactured by the same company.

Desktop's will have a lot more processing power for the money you are spending in comparison to a laptop. So maybe spend another 100 bucks on getting a better desktop, but a desktop is still the clear choice unless u need to carry it around.

Mainly it depends on what purpose you are using a pc.You should use the one that suits you the most and dont think about the electricity.:D