I am biased a bit, but I think Germany or France take it, with Spain or Belgium as dark horses.
I think Brazil has the most complete team of contenders.
Belgium already past their peak, their best defenders are old or retired. Also they should have done something (win euros) by now. They dont have big team mentality. They will fall on their asses again.
Spain lack a Villa or Torres type of striker. If they had that they could do something.
France too many injury issues and defending champs curse (their group is too easy to fail there). Swiss knocked them out even with Pogba and Benzema last summer.
Germany dont convince me either, still rebuilding and work in progress. All euro sides have flaws.
I was suspicious about Arg defense to win WC and of course some of their individual players form as we know very well like Di Maria.