whichever suits you best is probably the best answer... i'll say it now, that the fireblade models are replacements for the old airblades and powerblades. i liked ovals, so i chose the airblades. if i can't find the airblades i want, i'd have to settle with the new more expensive fireblade, since availability of the older racquets are now quite dry. if you're just comparing the racquets themselves, maybe the new ones? since they have all the new technologies, so i guess the fireblades? the aeroblades i think were asian market models. so those who find the aeroblades won't be able to get the fireblades as easily, and vice versa.
Powerblade 8800 Iso Power I just bought Powerblade 8800 Iso Power and BG65Ti...wanna strung it at 26lbs...will give some review on the racket performance... Cheers