If you want to cut a tenon, you could do the task with a backed hand saw, a dado stack or even a router bit. And all of those ways are perfectly acceptable. But, hey, you have a table saw (Well, most of us do, anyway) – why not consider a commercial tenoning jig?
Sure, you could build your own from scrap wood, but these babies are heavy, accurate and have a very quick clamping capacity.
This article by Wood Magazine shows you the ins and outs of the jig, how to set it up accurately and the best way to employ it in your own shop. If you are considering taking the plunge, this article is a good place to get some pointers.