What should I choose between low logical read and faster execution time

 Hi all,

Thank you in advance for reading my quesion.

I am tuning one suboptimal sql and have rewritten the sql in different ways,say them A,B and so on.

A has lower logical reads but longer execution time 7s.

B has higher logical reads but shorter execution time,3~4s.

A and B returns the same result set.

Our department usually buffer_gets/rows_returned to judge one sql good or not.

In this case, should I  choose A or B?

And another doubt.

Let's assume that the criterion is buffer_gets/rows_returned <M

With parameter X, SQL retuns 100rows with about N logical reads. N/100<M