As rayjay sez, it's a subjective question. Personally, I hate PH's and the way they look in my setups, so I don't use them (I try to design the flow into my systems) unless I REALLY need one and can't get around it (such as driving a chiller in a non-sump system).
MJ's are fine...just use the little input guard that comes with them so the SH can't get sucked into the PH.