Desktop versus Laptop

If I want a portable computer, I will go for tablets. My vote for this poll would be a desktop. Desktops can handle more hours of usage than laptops and if your desktop's keyboard gets broken, It is easy to buy a replacement. When a laptop's keyboard gets broken, You going to make a repairman few dollars richer.  Desktop is also better for gaming. Any laptop will crash and ends up in BSOD if you play Sims 3 on it.

You are right on it. If we think about durability then for sure desktops are much better choice than laptop computers. And you are also correct about costing of parts as laptop's part like keyboard and display are quite costly. And I have also noticed that DVD drive don't work correctly for that long in compare to desktop computer. For me my desktop is having low configuration than my laptop but still my desktop works more efficiently in compare to my laptop.

You are right that laptop got a number demerits when compared to desktop like overheating, difficulty in repairing, sometimes not easy to upgrade, not a game friendly machine (mostly),  keyboard issues, high cost etc.  But one of the distinct advantages of laptop is its portability.  As OP would also like to use it in office, I think laptop would be the only viable option.  My first laptop (IBM ThinkPad) lasted for around ten years without any major issues.  It all depends on how you use it.  If you are a traveling kind of person, a desktop would be of no use to you. I use my laptop with a USB keyboard attached to it.