It was just a question of which one of them would reach him first.
5 seconds sound clip from the Terminator 2: Judgment Day movie soundboard.
You can hear this line at 00:04:05 in the Blu-ray version of the movie.
Quote context
[...]
- Their mission, to destroy the leader of the human resistance, John Connor, my son.
- The first Terminator was programmed to strike at me in the year 1984, before John was born.
- The second was set to strike at John himself when he was still a child.
- As before, the resistance was able to send a lone warrior, a protector for John.
- It was just a question of which one of them would reach him first.
- I need your clothes, your boots and your motorcycle.
[...]