FSD Experimental Effects Trade-off
The Mass Manager and Deep Charge experimental effects for Frame Shift Drives both increase max jump distance, but Mass Manager is likely more practical due to less fuel usage - less time spent fuel scooping.
Fuel Usage
Mass Manager increases jump distance by 4% with no additional fuel consumption.
Deep Charge permits using up to 10% more fuel per jump, to increase the max jump distance by approximately 4%.
For "vanilla" jump distances (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 trips (approximately 10% when using max-range jumps) requires less time spent fuel scooping.
Max Jump Distance
The max jump distance of Deep Charge varies slightly with FSD Class (according to the hyperspace distance-vs-fuel burn equation[1]). Consequently, Deep Charge has slightly greater max jump distance than Mass Manager for Class 2 to 4 FSD (and less max jump range above Class 5)[2].
It is however less than 1%, and generally outweighed by the extra fuel scooping requirements, so Mass Manager is likely more practical for all FSD Classes.