Hey, i use a Well L96 and my brother uses the MB03. I have to say that i prefer my rifle to his, though his is considerably lighter. Depending upon attachments and such, my L96 will vary from 12 to 15lbs. The most i have ever seen a MB03 weigh is 11. Doesnt sound like much, but when your huffing it up a hill in a full loadout it gets heavy!
The Accuracy: The L96 is more accurate from the MB03, in my experience, though you need to use at least .28's in the L96
Power: My L96 chornod at 425 with .25 gram bb's. the MB03 chornod at 415 with .20. do the math
The MB03 also has a heavier bolt pull. Not too much of a big deal, but it makes it hard for quick shots on squads.
I say get the L96, youll probably like it.