The HD springs are the EZ ride spring with an extra leaf.
There is a recent tech article of Steve swapping in Tuff Country springs into the UAV. He chose the HD springs because he has the added weight of an aftermarket bumper, etc up front. He mentioned that if he wants a softer ride at some point that he'll take the extra leaf out and voila...EZ ride springs.
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what's the downside to the plain old EZ-ride? Will the front end sag if I get a winch some day?
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In short: yes. The EZ rides have a lower spring rating than the HD. Spring rate is given as weight/deflection. Say for example the EZ ride is 300 lb/in and the HD is 400lb/in (those ARE NOT the actual numbers). That means that with 300 pounds on the EZ ride spring it will deflect/compress 1 inch. So, if you put 400 pounds on it, it will deflect more than that...whereas 400 pounds on an HD spring will only deflect 1 inch.
Here's an idea: buy HD springs and right away make them EZ ride springs by taking out that extra leaf. Save the extra leaf and when you install a winch some day, put them back in the pack.