Usually I placed the 120 Ohm termination resistor pads in the PCB. So I could place the resistor or not during the PCB assembly for different applications.
However I suppose that the termination resistors should be a part of the transmission line - not the device. Besides, device user could be unaware of the fact that the termination resistor is already on the board and as the result - overload transducers.
On the other hand in case I don't have terminators on the PCB I will need them on the line which equals extra external components (terminal blocks, resistors...).
So the question is: which way will be the most convenient in terms of installation? Probably I could use 3-way RS485 terminal blocks (A, B, terminal resistor connected to the A or B). I could put a jumper accessible from the outside. Or finally I could skip the terminator at all as the speed id only 9600 baud (in my case).