Either one of your routers will be fine. As for the bit, I recommend a spiral upcut. The difference between an up cut router bit and a down cut router bit is the direction of the flutes. Here is more general information on the Ups and Downs (sorry could not resist that one)I've got a Bosch 2.25-HP and a smaller kobalt. Any special bit for edge trimming acrylic?
Since we presumably only doing trim work both will work. The rest of this is for general information. On an up cut router bit, if you hold the bit by the shank and point it straight down as if you were going to do a plunge cut into the surface of your work piece, you would be able to drill into the work piece by turning the bit in a clockwise rotation. With a down cut bit, you would need to turn it counter-clockwise to be able drill into the surface. An up cut bit is very efficient in evacuating chips up and out of the cut. It will leave a very clean finish at the bottom of the work piece, but will leave a rougher surface on the top of the surface (or the side that the bit enters the work piece).
A down cut bit does just the opposite. It is best to use a down cut bit for thru cuts, as a down cut bit pushes the chips down into the cut. Down cut bits will leave a very clean cut on the top of the work piece, but may leave a rougher finish on the bottom. Again, this does not apply to trim bits so an up cut is our preferred bit.