With the box the chance to fail is the same, it’s just that the tinker won’t explode in your face (damaging you) when it fails.
If you are an engineer with 30/30 in tinkers sub specialization, the switch is not needed, the box makes much more sense in that case.
If you are a non-engineer or you don’t have points in tinkers sub specialization, the switch would be a better choice in my opinion because it works more reliably (with a risk of it damaging you in the rare event it fails)