The "better" repack depends entirely on your hardware and patience.
Patching & modding
Integrity and stability
Installer features
Disk and time requirements
Choose RG Mechanics if:
Choose FitGirl Repack if:
The primary "mechanic" of a repack is how small it crunches the data.
Winner: FitGirl. If you have a data cap or slow internet, those 2 GB matter. The "better" repack depends entirely on your hardware