Depends, do you have a lot of time to claim manually? If yes, save up for a gold ore or more workers.
If you don't have that much time to claim, then put your gold into chambers.
Or at least, that is how I did it. But eventually I started to invest in chambers as well because I didn't had that much time anymore to keep claiming manually.

I do not know if this is the best strategy, but I just did what feels right for me.