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I have the reply relationship with like & unlike model. User can like for their best reply and unlike for bad reply. The like & unlike relationship is almost same,just store in different table. Now i want to get the replies that having most like & reply that having most unlike, compare them and show only the replies which have most number of vote. How can i achieve it?

In my Discussion Model

public function replies(){
    return $this->hasMany('App\Forum\Reply');
}

In Reply Model

public function discussion(){
    return $this->belongsTo('App\Forum\Discussion');
}

public function user(){
    return $this->belongsTo('App\User');
}

public function likes(){
    return $this->hasMany('App\Forum\Like');
}

In the like model

public function user(){
    return $this->belongsTo('App\User');
}

public function reply(){
    return $this->belongsTo('App\Forum\Reply');
}

I think you can use Eloquents withCount here.

So you'd have something like:

$mostLikedReply = Reply::withCount('likes')->orderBy('likes_count', 'desc')->first();
$mostUnlikedReply = Reply::withCount('unlikes')->orderBy('unlikes_count', 'desc')->first();

Note that withCount will place a {relation}_count column on your resulting models. That's why the orderBy is ordering on what the withCount applies, then by grabbing the first result, it should be the highest liked/unliked reply, from here you can compare what you need.