I'd say L2R, but I'm biased.
Seriously, though, it is like someone mentioned. The L2R is a dual ball bearing Garrett turbo stuffed in a Mitsu turbine housing. It has a 54 lb/min compressor wheel with a GT30 turbine wheel.
I'm not sure what the compressor wheel in the Green is, but you probably will never come close to the 54 lb/min that the L2R supprots unless you are heavily modded, ie stroked, cams, ported head, etc. And the BB cartridge gives full boost in the neighborhood of 3600 RPM, depending on setup.
The reason that there are few L2R's is because they were more expensive, than even the Green I believe. But, if you say they are less, then I would go with that.
With that said, the Green has been proven to be an awesome turbo in itself. Again probably more than you will ever need. It just matters price and preference in the end.