First...my thoughts on Indy. Indy does not even touch Spidey. Spiderman is on another level and took FAR more creative vision to make it work. If you enjoy Indy more, that's great as it is a great ride. However, Spidey is technologically superior as well as a more thrilling ride. I don't think this is even a contest.
Now that we have that out of the way...I've been on Journey to the Center of the Earth as well, and by my opinion as well as everyone in my group it does NOT top Spidey. Journey is only better with respect to detail and theming. In that sense, it is the best attraction I have ever seen. However, as a ride Spidey is the hands-down winner in my book. I walked off Spidey the first time I rode it and thought...Oh...My...God. There was no question in my mind that I had just rode the greatest themed attraction ever built. Journey, on the other hand, starts out with a very nice dark ride sequence that is textbook Disney, but ends with a about a 10 second, I am not kidding, 10 second thrill sequence. After the drop the ride slows immediately and you are left thinking...that's it? The others in my group all thought the same. Everyone was left underwhelmed. I had to talk my friends into riding it again! I am really sorry to say that since it is so uttery amazing from a theming perspective, but the ride ends way too soon and that is the feeling you end the ride with...not a good thing in my opinion.
Spiderman is a punch in the face from scene to scene, with an ending that "raises" you above the city and then points you around in so many different directions your brain is tricked into believing everything you see...it works perfectly.
Everyone loves to treat Journey like it is the end-all be-all ride. It is most definitely NOT. It leaves you wanting far more than what is delivered. Had the ending been extended to say a full minute of thrills, I might have a different opinion of the ride.
Best dark ride in the world = Spidey. It is perfection. It has never been topped, and I am starting to wonder if it ever will.