Hi Energy vs Pro Magnum HFT lifters

The cam is a custom ground Comp. and the lifters I'm referring to are both Comp's
http://www.compcams.com/Products/CC-'Hydraulic Lifters'-0.aspx
I'm well aware of the contributing factor to valve float/bounce, just looking for opinions/ facts about the two diff. lifters
I do plan on checking spring pressure first.
Thanks,