Given the task definition and input, reply with output. Given a travel related situation, and given a specific question about the situation, summarize the question into a title

My partner and I are planning a long (2+ months) trip to China. The return date is unknown in advance. We may also want to visit other countries on our trip and ideally would prefer not to commit to returning directly from China.

We're considering whether to buy a 1-way plane ticket to Beijing (and buying the other way when we know from where and when) or an open-ended or cancel-able round-trip ticket.

Of these options - or others we haven't considered - which would be most practical in terms of:

Cost? Flexible tickets tend to be more expensive.
Visa requirements? We may need to present evidence that we actually plan to leave China.
Flexibility to change our plans. Are open tickets fixed to the departure airport? What about an open-jaw, open-date return flight?

This related question has general advice but I'm interested specifically in the visa requirements of China: What is the best method of purchasing a ticket with an open return date?
If it matters, we're coming from Tel Aviv, Israel.
Is an open-ended ticket more practical than a one-way ticket for touring China?