Fördelar/nackdelar med alloc, init, release osv.

Jag har skrivit ett program men funderar kring användningen av alloc, init och release. Gör det någon skillnad i till exempel det här exemplet?

Jag har den här koden:

#import "QuoteController.h"

@implementation QuoteController

- (IBAction)SaySomething:(id)sender
{
	/* Create an array to contain the quotes */
	NSMutableArray *myArray = [NSMutableArray array];
	
	/* Fill the array with quotes */
	[myArray addObject:@"Me Fail English? That's Unpossible! - Ralp Wiggum"];       
	[myArray addObject:@"Kids, you tried your best and you failed miserably. The lesson is, never try. - Homer Simpson"]; 
	[myArray addObject:@"The doctor said I wouldn't have so many nose bleeds if I kept my finger outta there. - Ralp Wiggum"]; 

	/* Get a random index number */
	int index = (int)([myArray count]*drand48());

	/* Put the quote in a string */
	NSString *myQuote = [myArray objectAtIndex:index]; 
	NSString *myTitle = [NSString stringWithFormat:@"Quote number %d", index+1];
	
	/* Show the quote */
	NSRunAlertPanel(myTitle, myQuote, nil, nil, nil);
}

@end

Jag har den även omskriven till:

#import "QuoteController.h"
@implementation QuoteController
- (IBAction)SaySomething:(id)sender
{
	/* Create an array to contain the quotes */
	NSMutableArray *myArray = [NSMutableArray array];
		
	/* Fill the array with quotes */
	[myArray addObject:@"Me Fail English? That's Unpossible! - Ralp Wiggum"];       
	[myArray addObject:@"Kids, you tried your best and you failed miserably. The lesson is, never try. - Homer Simpson"]; 
	[myArray addObject:@"The doctor said I wouldn't have so many nose bleeds if I kept my finger outta there. - Ralp Wiggum"]; 

	/* Get a random index number */
	int index = (int)([myArray count]*drand48());

	/* Put the quote in a string */
	NSString *myQuote = [[NSString alloc] initWithString:[myArray objectAtIndex:index]]; 
	NSString *myTitle = [[NSString alloc] initWithString:[NSString stringWithFormat:@"Quote number %d", index+1]];
		
	/* Show the quote */
	NSRunAlertPanel(myTitle, myQuote, nil, nil, nil);

	[myQuote release];
	[myTitle release];
}

@end