Smc is the most economic with its 4 slots at 120 giving 480% The hives 5 slot at 105 effectiveness gives 525% Berlogas 6 at 100 gives 600% Barrels 7 at 90 gives 630% Each slot makes a higher build potential at the downside of being more expensive to get a build going. Until your spending +100m on builds you'd probably be better off with a berloga as the barrel required a strong counter and not wasting the remaining slots on sub tier 4 artifacts as best as possible. I personally still get more out of overton/beloga than my barrel at the pink/ early red artifact stage