I'm trying to build up equipments for EOD. but I'm quite confused on what to buy..

some say, use AMP equips
some say use VAMP equips..


which is preferrable? Can you use both of it?
If I use vamp, I don't know the calculations of it, all I know is the max HP you could absorb is 10% of your level and 5% of your MAX HP.. I don't know the calculations for that..

and for amp, do i need to have all equips with amp? or go cdr/cdi in some equips?


Thank you in advance.