Not sure about the other one mentioned but if it was strictly out of the 103 or the 109, i'd definitely go the 103 for the screw on 1/2 bsp thread. You can attach all sorts of fittings to it easily. I was worried about tightening a hose clamp on the 109 pump and cracking the inlet/outlet pipes.
I have the 103 and for what i use it for it rules!