what is the difference between UIImageView and drawInRect?

I want to display so many images in table cells. I knew two methods to show an image.

One is creating an instance to UIImageView and show it

CGRect rect=CGRectMake(x,y,width,height);
UIImageView *image=[[UIImageView alloc]initWithFrame:rect];
[image setImage:[UIImage imageNamed:@"sample.jpg"]];

Another method is,

CGRect rect=CGRectMake(x,y,width,height);
[[UIImage imageNamed:@"sample.jpg"] drawInRect:rect];

Now, my question is, what is the difference between these two? Which one is efficient? Or someother function is available better than this?

Thanks in advance....