i'm going to do my league finals tomorrow and i'm wondering which shoe should i wear for the 3200m. i have my old nike zoom matumbo (still wearable) and a new pair of nike zoom matumbos (never worn). i'm wondering which one should i wear. should i wear the old one which has a more flexible spike plate after all the miles i ran in them, or should i run with the new matumbos with a harder spike plate which maybe more aggressive?