for me 3/4" pipe clamps using black pipe can not be beat for sheer clamping power
well i suppose there are clamps meant for welding that are equal or better but pipe clamps are common in woodworking consistent sturdy durable cheap powerful
one annoyance is if they build up with glue but that is more operator error i usually focus on the project and forget about the clamps when i am unclamping
then i am reminded to scrape off the glue next time i use them not having used the bar clamps i do not know how the glue effects the usability