FSD Experimental Effects Trade-off
The Mass Manager and Deep Charge experimental effects for Frame Shift Drives both increase max jump range, but Mass Manager is likely more practical due to less fuel usage - less time spent fuel scooping.
Mass Manager increases jump range by 4% with no additional fuel consumption.
Deep Charge permits using up to 10% more fuel per jump, to increase the max jump range by approximately 4%.
For jump distances less than "vanilla" range (engines without experimental effects), Deep Charge behaves the same as vanilla, while Mass Manager always uses less fuel at any jump distance.
The reduced fuel usage of Mass Manager over Deep Charge over long distances (approximately 10% when using max-range jumps) requires less time spent fuel scooping.
The max jump range increase of Deep Charge varies slightly depending on FSD Class (due to the nature of the hyperspace distance-vs-fuel burn equation[1]). Consequently, Deep Charge has slightly greater max jump range than Mass Manager (less than 1%) for Class 2 to 4 FSD, and less max jump range above Class 5[2]. This is however generally outweighed by the extra fuel scooping requirements, so Mass Manager is likely more practical for all FSD Classes.