that is a tough call I rented the (G15 lvl 50) then rented the (R9 lvl 53) went back to the Taylor Made Burner Plus lvl 27 because I could hit them a little better then either set I rented.
Callaway ball or Sirxon ball made little if any difference.
The lvl 27 Burner Plus fills the gaps better with 90 to 195 yardages since rescue wood is 210 and new wedge is 93.
new set of irons 1250 to 1600+ credits.
new wedges 54 and 60 for 400 credits.
keep old rescue wood get same yard gap as buying a new set of irons for a 1/4 the cost by adding new wedges.