This is an ongoing debate. Traditionally body builders believed that Nolvadex is best for blocking estrogen receptors in breast tissue and clomid is best for blocking the receptors in the hypothalmus and speeding up recovery.
There is no medical evidence to support this belief; clomid and nolvadex are very similar chemically and they both perform the same function. I have used nolvadex successfully for PCT many times. Clomid may work slightly better but to say nolvadex is a waste of money is just misinformed.
But ultimately it's your decision, try clomid for PCT once, then try Nolvadex after the next cycle and see what you think.