To win the sale you must fervently believe your solution will benefit the client.  You must present your case so confidently that you will stand out.  The outcome will be you are so compelling the client cannot resist working with you.  Or they will say no --your offer is so clear that it does not fit.  Either way they understand your offer and will repsect your conviction.  What I've found is that many of these clinets who dont buy the first time around will often call you because they felt you really believe in the value you bring.