I am curious if there is a good reason I should / should not be using @synthesize for the tabBarController below, or does it not matter?

@implementation ScramAppDelegate
@synthesize window;
@synthesize tabBarController;

-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
    [self setTabBarController:[[UITabBarController alloc] init]];
    [window addSubview:[tabBarController view]];
    [window makeKeyAndVisible];
    return YES;
}

-(void)dealloc {
    [tabBarController release];
    [self setTabBarController: nil];
    [window release];
    [super dealloc];
}

OR

@implementation ScramAppDelegate
@synthesize window;

-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
    tabBarController = [[UITabBarController alloc] init];
    [window addSubview:[tabBarController view]];
    [window makeKeyAndVisible];
    return YES;
}

-(void)dealloc {
    [tabBarController release];
    [window release];
    [super dealloc];
}

cheers Gary