Heres my take I have had ps, hydro assist, and full hydro.
Regular PS sucks *** with tires over 33's but there is less to worry about breaking.
Hydro assist on my old dovetail truck worked great and I could still get out when my ps pump went out or if a line broke. It was not a kit just a put together kit.
Full hydro is great. Turns to well some times. Mine is a put together system, not one that you buy from psc or howe. Downfall is if your ps pump goes out, break ram, or blow out a line your stuck.