Assuming neither has been "bubba-ed" and are still in "as-issued-unmodified" condition, I'd say grab the 1903 first.
Reason being, now days there is less of them and they are getting costly.
Where as the Garand still can be found in numbers at the CMP.
Grab the 1903 before it gets cost prohibitive and set money asside for the Garand.
But you really need both.
CPT USAR Ret
USAMU Sniper School Oct '78
Distinguished Rifle Badge 1071