All these methods have their advantages, but I think only ASPA and drift alignment can be done with a blocked view of the sky around the pole.
And only ASPA allows good goto accuracy immediately after polar alignment is completed. It may not be perfect, but the mount knows the initial sky alignment so it can have good goto - and then you do ASPA - and when done the mount knows it is polar aligned and can adjust the original sky model accordingly. It may not be perfect, but it isn't completely blind as it is when using a device to polar align without also building a sky model for good goto.
But times have changed, and for imagers with plate solving there is less need for good goto accuracy. Just getting it polar aligned and then using a simple model that assumes the mount is level and longitude/time are accurate should get them close - and a plate solve based centering routine should center to the desired accuracy.
For a permanent setup none of this matters and you can take your time once to get it aligned. So these methods mainly focus on mobile or temporary setups. In that case being able to do it at dusk is important for saving time.
I think the main thing to keep in mind is there are many factors involved and "time to polar align" by itself may not be so important.
Edited by freestar8n, 09 July 2020 - 03:44 AM.