What exactly are the differences between each Robot Mode?

Some are obvious...
Assault probably boosts firepower
Melee has to be strength
Bulk would be endurance
but then there's 2 different computational & recon?
I've searched through the faq & ran a search through the forum about robot mode and nothing came up. Can someone answer this for me so I can decide what to go to?
Assault probably boosts firepower
Melee has to be strength
Bulk would be endurance
but then there's 2 different computational & recon?
I've searched through the faq & ran a search through the forum about robot mode and nothing came up. Can someone answer this for me so I can decide what to go to?