IMO from hardest to easiest:
CE
H4
Reach
H3
H2
Never finished H5 because its buns. H2 is by far the easiest. H2 isnt hard, it's cheap but you can skip most of the jackals anyway so no big deal.
CE
H4
Reach
H3
H2
Never finished H5 because its buns. H2 is by far the easiest. H2 isnt hard, it's cheap but you can skip most of the jackals anyway so no big deal.