一位朋友解释的:
if I make a recommendation, that implies that I have experience with the subject at hand, and have handled it with positive results. It also implies that if its good enough for me, then it should work out for you.
A suggestion is a weaker form of a recommendation. It implies that you've heard of success stories but have not had first hand knowledge of said results...
when you recommend, you put your reputation on the line.