Blue Steel is better imho.
Ironically, this joke is somewhat appropriate for this thread.
The original comment about Helix at Liseberg being the best or among the elite coasters in the world, will likely hold true based on its pedigree. This ride is an expanded version of Blue Fire, which is Europa park. Built by Mack, Blue Fire IS one of the best steel coasters on the planet. This is due in large part to the trains Mack as designed. These trains have a high center of gravity and are very exposed in that your feet don't touch the floor. Most importantly, these Mack loopers have LAP BARS only - the way Jeebus intended. They also feature onboard audio (the Helix music in the video is supposedly the track that will play during the ride).
Check out the sexiness of these Mack trains.
I have no doubt that Helix will be one of the best steel rides on earth. No lift hill, 2 launches, multiple elevation changes, several camel back hills with a very high probability of strong negative g, and it will have multiple of what is Mack's signature element - the inline twist. These twists with the aforementioned high center of gravity have made these elements out of the seat experiences on Mack's other rides. Factor in that Liseberg's topography and their stated intent of making Helix a first rate ride (which they already have 2 great rides in Balder and the Lisebergbanaan) and there is a lot to be excited about.
BTW - this is just my opinion; but, considering that is coming from over 450+ different coasters - I think I've got a pretty good frame of reference.
PS - I don't go out of my way normally to ride steel coasters. Once you've ridden one of each style from each manufacturer, they all sort of blend together. Steel rides for most part have diminishing returns, the more you ride the less there is to them. Wooden rides on the other hand are very unique and change with every ride you take. That being said - I'll go out of my way for a ride on Helix. It will be a special ride.
PSS - Millennium Force (or Forceless) is very overrated. It's not even the best non-looping steel coaster in its park, let alone one of the best rides in the world. After the superb first drop, first overbanked turn and ground level turn the ride becomes the 21st century equivalent of a high speed scenic railway. Sure it's fast in terms of MPH; but, it has horrible pacing. All of the elements are so stretched out and there are so few of them based on the track length. It's like riding down the interstate vs. taking a wild ride on a back country road. Don't get me wrong, MF is a "fun" ride and enjoyable; but, to attempt to compare it to the "great" rides (like Expedition GeForce and Ride of Steel/Bizarro) cheapens it. I think of it a the steel coaster version of The Beast. A really fun ride that is perfectly fine to say is a personal favorite; but, to call it great takes away from what great coasters do - wild pacing, out of control, negative gs, laterals, etc.