Kekkei Genkai not included are Rinnegan and Mangekyo Sharingan for obvious reasons, Dust Release because it is a Kekkei Tota an advanced form of Kekkei Genkai, Blaze Release because it involves a
Mangekyo Sharingan ability, any Kekkei Genkai from filler or movie because they are non-canon. Also Sakon and Ukon's Kekkei Genkai and Scorch release are excluded
So far we know the strongest of all is the Sharingan due to his possible evolutions to MS, EMS and Rinnegan (with or without hashirama′s DNA Help, so far that fact is not totally clear, though it′s likely Senju DNA is a Requirement, that can be stated as an unnatural evolution). And Lava releases since it has uses for offense and defense, if someone is completely covered in it they are dead. It easily can take on some of the other kekkei Genkai since its melts anything in its path.
If Mokuton had the ability to allow the 1st to overcome Madara and his fire techniques, then it must be one hell of a KG. Not only that, like other people stated, it allows the user to suppress a Jinchuriki and can be used offensive or defensive purposes. It's also environmentally friendly.