As others have said, they are almost identical. .260 will get you around 2,800 fps with 140's and and 6.5 creed around 2,700 wit 140's.
I had a 260 and was loading 42.5 grains of H4350 with 140 Berger VLD's shooting 1/4" groups. I now have a 6.5 cm and have just begun test loads, but the max charge for H4350 according to Hogdons is 41.8 so I loaded 41.5 and expect it to shoot around 2710 fps.
If you do shoot the VLD's don't use the target version (yellow box), use the hunting version (orange box). Almost same exact BC but the hunting version has a slightly heavier jacket. I always used the hunting VLD even for long range matches and it shot great.
Also try the 143 grn Hornady ELD-X in whichever one you go with. They should shoot similar to the VLDs for about $10-$15 less per box of 100 bullets. The ELD-x might better on elk since it will retain much more weight whereas the Berger VLS is really more of a shrapnel type bullet.