which is better when reading files

[Enjoy_Life]

hi, who can tell me which is better of the following codes?
why there are different methods to read files?
thanks

1. open(INPUT, "< filedata")  or die "Couldn't open filedata for reading:
$!\n";
    while (<INPUT>) {
        print if /blue/;
    }
    close(INPUT);

2. use IO::File;
$input = IO::File->new("< filedata")
    or die "Couldn't open filedata for reading: $!\n";

while (defined($line = $input->getline())) {
    chomp($line);
    STDOUT->print($line) if $line =~ /blue/;
}
$input->close();


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