Except they are using 40nm GPUs, run DX 10.1 and both are use CUDA fully. the G210 and 220 are Nvidia’s first 10.1 cards. Although they were based off the same 9 series core. The 100 series were the ones that were all re-brands.
depends on your budget.
I would suggest the HD5870(~400€) or HD5850(~300€) or HD5770(~140€)