In my experience, yes.

Garlic powder has the obvious advantage of no strong odour. Yesterday at work someone told me I smelled of garlic, and it had been 3 days since I'd eaten it!

No, just do a google search on raw garlic vs garlic pills or garlic powder. The property that makes raw garlic effective is not found in the processed pills. There may be a slight, very slight benefit, but nothing like raw garlic. Unfortunately it does smell really bad!

If u dont like the smell then what's the use of taking it.

Raw garlic should be chewed/crushed to bring out the active constituents.

I like garlic Oil if I use a supplement, but I use LARGE doses of oil if I dont have fresh, 35,000MG + in a day. I also combine it with Turmeric/Curcumin.

Adding cayenne to the garlic is a good bet, it helps carry the treatment to more parts of the body than it would normally reach, although garlic does reach pretty much anywhere I imagine, but cayenne can't hurt especially with parasites!