H1B or AP, ...??

I am on H1B status and have AP, and I-485 (PERM track) is pending. I plan to go back to China. I m not sure whether to use AP or H1B to come back.

If using AP, is H1B still valid? Can I extend H1B? And can I transfer H1 to another company if chnging job?

If using H1B, then what's the usage of AP to me(I don't want to find a part-time job)?

Thanks in advance for helping analysis of the situation!!