Well there are fixed base, plunge and table mount routers. All can be mounted in a table, but the plunge offers the greatest versatility. You can lock the base and mount it in a table, use the plunge feature to countersink joysticks and drill buttons and plexi, and set the depth and use the t-molding bit to cut your edges.
It takes a bit of practice to do a good t-molding groove. I've done quite a few, and I find it easier than I thought to get "off track". be sure you have goggles and maybe even a mask when you do it, as I noticed cutting the molding grooves created more dust than almost anything esle...especially if the cabinet is upright for some reason...I was spitting out sawdust for a week!
Not trying to make up your mind, I have both a fixed base and a plunge, and I realey use the fixed base one.