I keep coming back to the Incra I-box jig and the Freud 1/4-3/8ths blade for general use. For larger fingers, I just use my dado set. The Incra jig adjusts for whatever dado stack I choose and cuts perfect fitting joints. The router bit approach is far less than the $164 jig, and if you add the Bosch blades and/or decent 8 inch dado set, the cost is significant.
If cost is an issue, then a quality, sharp, clean router bit, plus a little cleanup and using entry and exit sacrificial pieces works OK, so long as there's no chipping to ruin the piece.
But there's no question that the Incra I-box jig is a great solution for freuent box makers, or anyone who wants to make a long box joint on larger sized projects.
The more I do, the less I accomplish.