Deca is a stronger steroid that will yield more noticeable strength and size gains. That being said, it also has more sides. Deca can cause libido issues and could cause progest gyno. NPP is a faster acting nandrolone, I would recommend it if you choose to go with Nandrolone.
EQ is a milder variation of test that takes longer to produce results. It has few sides. Most athletes that can't deal with Deca sides choose EQ as a replacement.
Me personally, Im a gyno magnet so I go with EQ. No less that 600 mg, no less than 20 weeks.