Not really... they're all going to be pretty much the same thing, besides the ICS design - although I've heard of some alignment issues with those. There are some issues of backlash with them.
Going with a standard v2 gearbox, you can't go wrong with a G&P, Hurricane, Progear, etc etc type setup. I don't really recommend the Guarder ones, since they need some work to get stuff to fit/work right from the get-go. Even Marui gearboxes are fine (if you can find them), assuming you're not using a high powered spring, rigid piston head and/or in the winter.
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