Hk47 only works in a droid team, while ig88can fit in different teams (aoe or crit team for example)
So I suggest you farm ig88 first. After you have ig88, you can get hk47 to complete a droid team
Cheers yeah I prefer ig-88 anyway so that's good. I have sidious (obviously) darth maul, boba fett, captain phadma so he should fit in well with my dark side team right?
If you had to pick only one and aren't doing a droid team, definite IG-88. HK-47 is just too slow to pose much of a threat. Whereas IG-88's massive AoE AND single target damage make him a constant threat
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So I suggest you farm ig88 first. After you have ig88, you can get hk47 to complete a droid team
Sid leader, ig88, darth maul, poe, lumi (or boba)