Thanks a lot for detailed and solid advice.i henrysmith382 Glad you joined the fun.
The 618 is about double the horsepower, vs the 611. The 611 only accepts quarter inch shank bits, the 618 takes both 1/4 and 1/2 shanks. This is important for table routing. Working with the router in a table is FAR safer than working freehand. I don't know of any simple way to mount a 611 in a table, although I imagine it could be done. It just doesn't have the power the 618 has for table use.
The 611 is really nice for small tasks, for example, cutting a shallow mortise for a hinge, or rounding over an already assembled project.
I prefer the Bosch 1617 to the DeWalt because the Bosch has a micro adjustment with no play, vs the DeWalt's big thread. There are all kinds of router mounts that allow you to adjust bit height, but Bosch makes a simple little base for about $60 that works fine.
But there are a lot of people here who like the 618 just fine. The one thing I do like is the DeWalt is low slung, not top heavy, which for freehand use is very nice. I got the Bosch after finding the DeWalt on display had been broken, which shouldn't happen in my estimation. There seemed to be a lot of play on the height adjustment on other DeWalts I've tried.
Many of us have both a half inch shank and a small, "trim" router. But with only one router in the shop, get the half inch collet model of whatever brand you get. My quarter's worth on that.