I do this while freelancing/contracting as well. I have a macbook for client work only.
While I don't have a one for each potential client, I do use a different user for each client, and all data should remain in user space -- which is easy enough to accomplish since I need to maintain matching versions of databases anyway, there is no need to share a single data store.
While I don't have a one for each potential client, I do use a different user for each client, and all data should remain in user space -- which is easy enough to accomplish since I need to maintain matching versions of databases anyway, there is no need to share a single data store.