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So I've narrowed it down between to rival armies. haha
I love both armies
could i get some pros and cons for each army?
I love the fact GK are termies and the dread-knight and remind me of the good guy army
On the other hand CSM are Possessed and mutated Warriors of Chaos
Con I dont like are GK are to small and CSM are transport dependent i think.
Any help would be fine.

Both armies are kinda transport dependent tbh.

Both armies have access to flyers,
GK have access to arguably better psykers.

There's a neat list
http://www.theruleslawyers.com/2012/10/building-the-case-giantkillers-chaos-space-marines-with-necron-allies-at-1850/

uses CMS with necron allies

I would argue that chaos can get along just fine without transports. You can have big mobs of guys, and if you don't go to town on upgrades, they can be fairly cheap, while still being fairly durable. I recently ran a 1500 point army that did quite well and it only had a single vehicle in it. Based off memory it was something like:

Hq: Lord - Jump pack, Sigil of Corruption (4+ invul), Gift of Mutation, Mark of Slaanesh, Black Mace, Meltabombs
Sorcerer - Mastery level 3, Mark of Slaanesh, Sigil of Corruption, Gift of Mutation, Burning Brand of Skalathrax

Troops: 10 Cultists
10 Cultists
20 marines - Mark of Slaanesh, Icon of Excess, 2 Plasma, meltabombs (champion), power sword (champion),

Elites: Hellbrute - Plasma Cannon

Fast: 10 Raptors - Mark of Slaanesh, Icon of Excess, 2 Meltas

Heavy: 1 Obliterator - Mark of Nurgle
1 Obliterator - Mark of Nurgle
1 Obliterator - Mark of Nurgle

This came out to close to 1500 points (don't have my book or list with me right now, so there may have been some stuff different), and still had the benefit of decent anti-tank, good anti-infantry, and some mobility with the raptors and the lord.