The string comparison operator eq puts its operands into scalar context:

#! perl
use warnings;
use strict;
use 5.010;

say 'equal' if context('1') eq context('2');

sub context
{
    my $c = (defined wantarray) ?
                    (wantarray  ? 'list' : 'scalar')
                                         : 'void';
    say '(', shift, '): is in ', $c, ' context'; 
    return 42;
}
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Output:

15:56 >perl 457_SoPW.pl
(1): is in scalar context
(2): is in scalar context
equal

15:56 >
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So, neither code snippet is doing what you want. The first compares the sizes of the two arrays. The second compares the size of @array with the value returned by reverse, which

In scalar context, concatenates the elements of LIST and returns a string value with all characters in the opposite order.

To compare the contents of the two arrays, use the smart match operator ~~. See How do I test whether two arrays or hashes are equal?

Hope that helps,