I would say 7DMT. Many think it will be close to BTMR, but I just don't see that at all. I think the best answer is it will be unlike anything else. I think it will be slightly more thrilling than 7DMT, but no where near as rough, fast, or thrilling as BTMR. I know the high banking turn looks intimidating, but it's really not that high off the ground. I think this will be a fun, smooth, unique, but short coaster that everyone can enjoy. Nothing that will get the blood pumping for teens/adults though.
I've also seen people say they are impressed with how long the track looks. I'll say it looks slightly better than the concept art they first showed in terms of thrills, but I still expect this to last under a minute. 90 seconds at most, depending on how long you are stuck waiting on the launch.