I prefer CA because it is much stronger, for there is nothing worse than having the rails pop off a few weeks later.
I use Goldberg Jet Medium and dispense it through a hyperdermic needle. I first measure out points and draw / trace the layout of where the railings go on a piece of paper, then form the railings to that layout with my sharp exacto and metal straitedge as a break, then place a fine bead of CA on the model with the syringe and with tweezers, place the railing directly over the bead.
I wish I could remember where I read about this technique, but I found it best for me.
the syringe makes it easy to control the amount of CA, which is important since I don't want either big blobs or thin areas of coverage which can make placement difficult. The blobs and thin areas causes the PE to "float" which makes placement of the railings like dancing with an octopus.
The medium CA takes a few minutes to fully cure to a permament bond, so there is enough time to do some adjustments. It also fills in gaps well. I do a lot of final shaping after the CA has fully cured.
Two tools that are a must for me is my lighted magnifying light and a set of good tweezers. Being able to see where the details are going is harder for me than doing the actual placement.
Scott