i tried both, and from my experience. fresh installation is better.
i have run benchmarks from the SSD cloned and the same from a fresh install and they gave me better results.
MAximusS V Extreme + XFX 7970 black ed CrossfireX + 3 tb WD Black + Crucial m4 OS/Games + TT 1000W TRX2 + 4 Multi -Display + Xonar DX7.1 + Core i7 3770k + 16gb Gskill TridentX 2.4ghz + LG 2486l display x 3 + philips 42" tv + Thermaltake element V + Harmand/Kardon and Polkaudio 5.1 sound system ready 😛