hi
we recently done so, i prefer system copy, the reason very simple, solman_Setup is the only thing you need to execute again, but tat also most of the steps automatically pops with green (like DB, RFC connection). other big advantage is your custom modifications are safe, no need to do it again. your logical components, bpmon and other monitoring stuffs are safe, no need to do again, just verify back after solman_setup
its regular system copy approach, align with the proper post system copy activity.
Thanks
Jansi