They are both some of the lowest. They don't add speed, but they do add other things, but sped it what the deck is all about. I even recently took out momentum for a chaos power. I got alot more 4 turn and 5 turn kills and it can raise defense of the card as well allowing it to stay alive.
Upgrade order ( full )
First
Elite Graboid, Gavel, Elite Graboid, Elite Graboid, Elite Graboid, Elite Graboid
Second
Gaint frog, Chaos power ( take out forest spirit, and momentum. )
Third
Ball of lightning ( take out Photon )
fourth
lycanthrope and creamation
Do not upgrade Super nova. ( For newbies that see this )
remember the only defense this deck has is hard to kill creatures, and thats it! This deck is built for pure speed, I even though about adding another chaos power by taking out a lycanthrope. It would give the possibility of a 3 turn kill. Heck with 9 upgrades this deck CAN 3 turn kill though I have yet to pull this off. It would have to be what a 4 turn kill hand would be but add a chaos power and get the max boost. With 2 chaos power you can have a much higher chance of a 3 turn kill.