The G1 collector, for starters, is a lot more advanced in terms of GC technology. From what I remember, the CLR is a simple generational collector. I've also

The G1 collector, for starters, is a lot more advanced in terms of GC technology. From what I remember, the CLR is a simple generational collector. I've also seen examples of the JVM running well on extremely large boxes, where as I have not seen it with the CLR.