Just had an interview; it went really well and I'm certain they will phone me later to offer me the job. (They said as much when I left.)
However, I have another interview next Monday for a much better position (better pay, in my field, 5 mins walk from home). This one's more of a long shot but I'd really like to get it.
Do I tell the first employer I will let them know next week, or should I accept the job and then rescind if I'm offered the second job?