I have the intension of buying a Drill, At shops, I see the corded and cordless Types, Although the cordless drill is more handy and portable, I always have a little doubt about that it's effectiveness and efficiency might not be as the corded type.....Is it true and also is choosing a cheaper manufacturer going because they are cheaper going to affect the quality of the Drill?
Go to any site where they are building homes. 80-90%+ of drills there will be cordless. Until the past 5-10 years most consumer cordless drills were almost worthless for heavy duty jobs. But that simply isn't true anymore. The big boxes carry good brands and you can get more than enough power from a $200 cordless drill that comes with two batteries and a charger.
The downfall of the corded drill is you need electricity. I would say 1/3 of the time I am using my drill I have no or poor access to electricity. If you are drilling on a bench next to a socket then this shouldn't concern you. Also if I am working around a house it is rather annoying having to plug and unplug drill or keep it from getting caught on something.
I have a corded drill. It has two uses. I use it when I am mixing cement/thinset or something similar. Doing this with cordless isn't a great idea. The other is when I forget to charge my batteries.
Note: one negative is that I misplace my makita almost daily. Doesn't happen with corded. But then kids don't get to play "find dads makita".
For a professional, a cordless drill is a no-brainer. You're frequently away from a power source, moving around all the time, using it frequently enough that keeping it charged isn't a concern, and using it so hard that it will likely burn out and require replacement before the battery dies and the product line becomes obsolete and they don't sell batteries any more. And you can write off the purchase as a business expense.
For all these same reasons, a cordless drill doesn't make sense for a homeowner, in my opinion. You'll be using it in and around the house nearly all the time, with ample access to power. The infrequency of use will mean that unless you keep the battery constantly charging, it'll be out of power when you need to use it. And since you'll probably want to keep it for 10 years or more, it will be a major hassle when they stop making the batteries in 5. A corded drill is also cheaper than a cordless drill. Typical homeowner use will not destroy even the cheapest drill.