It depends what you're hanging on it
12' is too high for deer on my opinion.
My standing reach is only about 7' comfortably. So an 8' pole would be enough.
One pole we have requires ladders to get up to it, and it's a pain in the butt. It looks cool though....
I use ratchet straps and I prefer to be able to reach and adjust them by standing on a stool or bucket. Not needing a ladder.