iOS CoreData: How to setup the core data "connection"? Stanford UIDocument vs. Apple template?

I've worked through the Stanford course and setup my first app and core data as in the lecture. Approximately like this (I will shift the code into the app delegate now):

- (void)setupFetchedResultsController
{
    NSError *error = nil;
    NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"MainCategory"];
    request.sortDescriptors = [NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"position" ascending:YES]];
    [self.budgetDatabase.managedObjectContext executeFetchRequest:request error:&error];

    self.fetchedResultsController = [[NSFetchedResultsController alloc]initWithFetchRequest:request
                                                                       managedObjectContext:self.budgetDatabase.managedObjectContext
                                                                         sectionNameKeyPath:nil
                                                                                  cacheName:nil];
}

-(void)useDocument
{
    if(![[NSFileManager defaultManager]fileExistsAtPath:[self.budgetDatabase.fileURL path]]){
        [self.budgetDatabase saveToURL:self.budgetDatabase.fileURL forSaveOperation:UIDocumentSaveForCreating completionHandler:^(BOOL success) {
            [self setupFetchedResultsController];
        }];
    } else if (self.budgetDatabase.documentState == UIDocumentStateClosed){
        [self.budgetDatabase openWithCompletionHandler:^(BOOL success){
            [self setupFetchedResultsController];
        }];
    } else if (self.budgetDatabase.documentState == UIDocumentStateNormal){
        [self setupFetchedResultsController];
    }
}

- (void)viewWillAppear:(BOOL)animated
{
    //Initialize database
    [super viewWillAppear:animated];
    if(!self.budgetDatabase){
        NSURL *url = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentationDirectory inDomains:NSUserDomainMask] lastObject];
        [url URLByAppendingPathComponent:@"BudgetDatabase"];
        self.budgetDatabase = [[UIManagedDocument alloc]initWithFileURL:url];
    }
}

The code in the Apple template (if you check "CoreData" when creating a Xcode project) looks very different and more complex. What's the difference to this UIManagedDocument? Is there a better or worse?