Need help choosing Irons?

Well I am an intermediate golfer, 20 years old normally shoot under 10 over using my old clubs which are a random collaboration that have mostly been given to me. I have the opportunity to get a new set of irons but having a hard time deciding between Taylormade firesoles or Cobra 3400 I/XH...they are very close in price and in similar condition....both have stiff shafts and with my regular shaft knight irons i have now i have some slice. which set would you recommend?