The most used time is from home to 1st, because it is used every game. The 60 time is something that is done at a showcase or tryout camp. They both have value, because the 60 tells the scout how fast you are compared to other players in a race. The home to first time has value, because it also compares you with other players, and how fast you get out of the box. I have seen many guys who were 6.9 60 runners that ran 4.6 down the line. The two times give the scout a comparison between getting out of the box and straight away speed.
PS---unless the times are unreal, I don't give either one too much thought, as hitting, fielding and throwing are more important to me.