Ben-Hur
A remake of the 1959 Best Picture winner, "Ben-Hur" makes great use of the 3D effect, but, sadly, comes off as a pointless remake. Going into the movie you know there is no way it can top the 1959 classic, but it is disappointing none-the-less to see the results fall this short. The scene that makes best use of the 3D is the chariot race. Even still, the cost of an IMAX 3D ticket can buy you the original movie on BluRay (with "The Ten Commandments" thrown in for good measure), so this isn't the best option.
Kubo and the Two Strings
Stop motion 3D movies can be very hit or miss in terms of whether or not the effects are worth paying the extra money for. 'Kubo' falls somewhere in the middle here, but the movie itself is so good it's worth paying the extra money for those two or three scenes that truly benefit from the effect!
Pete's Dragon
This is the movie that makes best use of 3D that you can see this weekend. The bad news is the film opened last week to lukewarm box office, so some of the 3D screens have likely been sacrificed for newer movies. If you can find a 3D screen showing this though, it is well worth the money, as it is one of those truly magical experiences that 3D can offer. Also, it should be noted that this is a Disney film. So that combined with a poor box office opening means... enjoy this in theaters, because we likely aren't getting a BluRay 3D release.
Suicide Squad
It pains me that this is still part of the conversation, but not only is "Suicide Squad" still widely available in 3D, but Cinemark XD backed out on their commitment to screen 'Kubo' on their screens to keep this, and a good chunk of IMAX screens are doing the same for their commitment to "Ben-Hur." I can not stress what I lousy, terrible movie this is, with editing and camera shots that are so bad the 3D actually makes the movie look even less comprehensible. This is one to skip at all costs... even though it looks like it might top the box office for a third week in a row.
OK, so only the worst of these 3D releases will make it to BD. That's seriously depressing. I stopped going to the theater almost a decade ago, but I buy movies on BD (and specifically for 3D) almost every week.