Obviously it depends on your
budget. We have global entry which we use as my family lives abroad, so being able to save time in the horribly long immigration lines when traveling with kids was our primary goal in getting it, but the shorter pre-check queues are also great, as well as not having to remove as much from your bags.
We also got clear last year and that has been absolutely fantastic, as a lot of the time when pre-check is taking longer than normal it's because of the ID checks.