I'm no expert, but I decided to go with a classic solid two-blade broadhead. I wanted everything to be more classic rather than modern.
I am going to be using, for the first time, 125gr Zwickey Eskimo Black Diamond glue-ons mounted on some 3Rivers cedar arrows.
They fly very good for me. I hope to be using them for years to come.
I am getting up into a tree on Thursday for a black bear to start my year off. I have no doubt they will get the job done.
Shooting off the shelf and the blades are vertical. I don't think it would really matter much about the blade being vertical or horizontal. The helical fletching make the arrow spin anyway.
Good luck.
And this is from my 3rd time shooting a recurve bow at 20 yrds. The Zwickey broadheads seem to fly pretty well. Don't take my terrible grouping as something wrong with the Zwickeys. It's purely operator error and inexperience (3rd time shooting).