To paraphrase what mobowhuntr said:

Blazers are better in that they do what a larger vane can do and are more durable.

But here's your chance to find out! Have those feathered shafts fletched with blazers and shoot both! Then when you come to your senses, go get the vanes replaced with blazers

Oh and while you're at it, get a dozen new nocks. Its more than worth the five bucks! Worn nocks can significantly affect performance. If available, give beiter hunter nocks a try!