The G30 is a great car. Certainly much better than the F10 it replaces. However, it is still large and insulated. If you need a large or comfortable car, go with the G30. If you don't need the bigger car and prefer a bit more sportiness, go with the G20. The G20 also has a more updated interior (fully using BMW's new interior design language unlike the G30 which is a mish-mash of new and old), although the G30 has more available tech. I'm assuming though, you will stay in the same price range in which case the G20 might actually be better equipped.
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