Are some maps more likely to drop Mageblood or HH?

Also is there any place I can find reliable information on which maps drop which uniques?

No to the title, some uniques are mob specific like redblade uniques only drop off redblade mobs and boss uniques obviously but anything in the general pool drops anywhere.

Only thing i'd be careful of is some items have a drop restriction for area level even if the items requirements are lower however for any reasonable farming strat this is pretty irrelevant.

Best bet if you want to "Farm" HH is to farm the cards, this takes a pretty extreme amount of time and patience but is still much faster than expecting to get one as a natural drop.

Thanks for your answer bro. I'll try that.

If you don't mind a follow up question. I''m planning to run some shakari-touched archnem. Is there any strat (outside of nemesis recipes) for increasing the rarity of those unique drops?