For me it's the Los angeles lakers
Lol, I'd love to see the Lakers win but unfortunately it won't happen because they have a young core of players and are in rebuild mode, maybe in 4-5 years but this season not.
This season there are a lot of pretty good teams and I know this will sound dumb but for me personally it's still early to judge.
Minnesota are a good team still haven't reached their full potential, the same goes with Oklahoma.
Golden State are obviously favorites but this is when teams like Boston, Houston (if Harden stays healthy), Cleveland and Spurs come in.
I'd say Toronto but in the playoffs they always play different than what they used to play in the regular season.
So to answer your question, in my opinion Houston if Harden and other key players stay healthy could win the 2018 Championship. They already won against the Warriors twice so yeah, Houston Rockets NBA Champs is my answer.