i don't thnk so,i've tried it too and i think menggong is better.
sunmo can took them away faster than he took away that evil doctors with his summoned units
which will give you more 400k++ exp.
because you need
time to wait for the doctors to summon their units (gatekeeper)...
and for the conclusion,you can take down menggong much more than evil doctor in long term
(note : if you can kill menggong instantly)
besides,i see there are very much evil doctor-JUNK (you know what i mean)
when i was hunt there (dunno about now) in their areas which make me lazy to hunt them anymore.
that's all IMO