This was a shocker when I looked it up. According to Morningstar: CGMFX has a trailing 5 year total return as of July 22 of 29.81%. CGMRX has a trailing annual 5 year return of 32.32% for the same time period. To top it off RX is slightly ahead this year so far. FX has the better 3 year record, likey due to last year's tremendous gains.
iggie, I think you're splitting hairs. I looked it up and CGMRX had a phenomenal 2003, 89%. I don't think because CGMRX returned 3% higher over the past 5 years means it will continue to outperform, it could be the opposite over the next 5 years. What you could do though is diversify by buying both. I just own CGMFX because he has more flexibility, though I am becoming concerned about the size of the fund.