Wildforce Megazord, or Animus if he counts. (even if the character was utterly awful)

Other favourites include the Zeo Megazord, whatever the bettle Megazord from Ninja Storm was, and Supertrain Megazord.

Main: Zeo,Dino,Wild Force,Lost Galaxy,Gosei Great,Samurai and Jungle Master

Secondary: Red Battlezord,White Tiger Warrior,Predazord,Defender Torzord and Gosei Grand.

Dragonzord in battle mode. Loved the staff of death!

WildForce Megazord and Wolf Pride Megazord.

I'd want to say Dragonzord, but I think I'd have to pick one of the megazords that's survived and I still have till this day…

Quite possibly it would be the Astro Megazord, I loved how stream line the design was compared to more traditional sentai mecha

Samurai Megazord, WE ARE UNITED!

Predazord Megazord easily, with only the Thunder Megazord close to beating it.

The Thunder Megazord from season 2. Just looked so badass.

Dragonzord
 

Its hard to say but I'd have to agree with Kiryu, the Draongzord is still my favorite zord of all time. But, In second place is "Pyramidas" the gold zeo ranger zord, because its so epically badass lol. I know those aren't really Megazords, so I guess my favorite would have to be the Thunder Megazord.

Here are some designs for a re-imagined Dragonzord I did for a fan film I'm currently helping out on. Check it out!

http://th00.deviantart.net/fs71/PRE/...fe-d6uvbl8.jpg

This is the final design:
http://fc08.deviantart.net/fs70/f/20...fe-d6v73ar.jpg

Find out more about this project here: http://www.kickstarter.com/projects/...ngers-fan-film

Im gonna have to go with the astro megazord, with the turbo megazord as a close second.