OK,
whats the current consensus today over fletching for hunting arrows?

I'm from 'old school' where 5" helical fletches were the rule for best control. Now I see today that virtually all arrows being sold today are slightly offset or straight fletch. So whats the deal? I've been in college full time for the last 4 yrs working on my RN degree and just haven't had time to read bowhunting articles, etc.

Do we really NEED helical for hunting arrows or not?