What takes canon precedence, the Clone Wars TV series or the novels?

In Labyrinth of Evil Anakin and Obi Wan were led into a decoy by Dooku and were on this planet when they were asked to help out in the battle of Coruscant. In the Clone Wars series, they were on a planet with a secret Techno Union lab before being called back to the core.

Which one is canon?

The novels are definitely more canonical than the Clone Wars series.

Novels for sure

Why is everyone so sure its the novels? If I'm not mistaken Lucas actually had some direct involvement in the TV series, wouldn't that make it more canon?

I was leaning toward the series but wasn't 100% sure, I asked here just to be positive, am I missing something?