They're pretty different.
The Caffeine-Free pill is almost exclusively for the brain. It gives you a sharp mental focus, but doesn't do much physically. Although it may help training, in an indirect way.
The Shooter is almost entirely physical.
The regular Spike pill is in between, as it were, both mental and physical.
Don't take it with any other STIMULANT. Huge difference.
Spike is awesome.
But fix your diet and sleep first, then see if you really need stimulants.