Difficulty in Withdrawing from opoids is in proportion to their potency (Normally). Vicodin (Hydrocodone & acetaminophen) is more potent as an
opoid anlgesic than Tramadol (Ultram), thus it is more physically addicting.
Psychological addiction can be subjective (individual), or variable. It can
So physical addiction to Vic. is more severe than Ultram addiction. But
psych. addiction can vary considerably.
PS: it also depends on the length of addiction and amount taken, as well as
many other factors.