Anderlecht will host AZ Alkmaar like a favourite for win,but,i will rather chooce option over 2.5 goals.Reasons for that are Anderlecht not the best defansive line,Westerlo were capable to score against them one goal,also few more bad teams from Belgium do it.Anderlech is good in attack,play open football,the same like AZ Alkmaar.Both teams are from overish leagues,and botrh teams are overish,in globally thank to their style.In first match was 1-0 for AZ Alkmaar.Now,Anderlecht must go to attack and try to score goals,becouse if they recieved one,they must score three time.For me,the best choice here is over.Good luck.