From the Parramatta Meet thread:
Vehicle Voltron much cooler than Lion Voltron. Never been a huge fan of the latter... come on, 15 vehicles that can dominate over land, sea and air (and space!) attached to a mobile battlecruiser is just so much cooler than five robotic lions based in... a kingdom? :p
And the Vehicle Force crew had non-humans too! It made it far more scifi and believable that Voltron was part of the Galactic Alliance. Plus that blue-skinned elven chick was HAWT! (Kirk'd!) :D
And the torso and head were separate vehicles whereas with Lion Voltron it's the same damn lion - so it made no sense when Keith would go, "form arms and torso..." - but wait, you ARE the torso! - "...and I'll form the head!" - what?! The head's attached to the torso? Oh... the head just flipped down. That's "forming" the head?!? It looked way cooler seeing that jet fly onto Vehicle Voltron's shoulders and _actually_ forming the head! Then the finally with that red jet forming the breastplate - yeah! And Vehicle Voltron had hands! He could flip the bird to a Ro-Beast... ya know, if he wanted to. :p
And forming the Blazing Sword with those two helicopter blades was cooler than just ... where the hell DOES Lion Voltron pull his Blazing Sword from?!? Sub-space??!? (o_O) And why pilot LIONS?! Your choice of intergalactic military vehicles: armoured terrain vehicles, submersibles and jet fighters vs. big cats. Ummm... hello?
Vehicle Voltron >>> Lion Voltron (plus their leader sounded like Optimus Prime cos he was dubbed by Peter Cullen! Phwoar! I think Cullen also dubbed some old mentor dude in Lion Force, but his character in the Vehicle Force series was actually their commander!)