Very difficult one to answer. If we're talking about the rides as they were when they opened then Indiana Jones Adventure, without question. I haven't been on it in years (thankfully, as I hear it's in bad shape these days) but when it was new and every effect worked, it was truly something revolutionary. Basically every scene is iconic, leading up to the finale which is probably the best example of taking something on a film and making it happen in real life, every 30 or so seconds. Even now it's an incredible ride, especially if you go on the Tokyo one which has been kept in good shape. I hope they're able to restore the Anaheim one to its former glory during this refurbishment.
Rise of the Resistance, which I was lucky enough to ride twice, is an incredible achievement, and the way the experience takes about a half hour is really cool and remarkable, but for some reason it feels pretty sterile to me. Maybe it's the cold metal interior of the Star Destroyer, or the way it's based on the new movies which I don't think anyone really cares about, but it feels like something is missing.
One attraction that isn't on the list that should be is Radiator Springs Racers. It's not necessarily a technical achievement in the same way some of these other rides are, but it's one of the best examples of what Disney can do really well when it wants to: an exciting ride with a bit of a story. Especially at night, the surrounding area and the views from the ride are some of the best in any park.
And finally, though I've only seen POV videos of these, the two more recent rides that tell me that Imagineering still has the spark (when time and budget allow, of course) are Runaway Railway and the Beauty and the Beast ride in Japan. Runaway Railway especially is nice to see, as we expect greatness from the Japanese parks, but such a wacky and entertaining ride that also uses cutting edge technology in the stateside parks was a good sign. And Beauty and the Beast looks absolutely mind blowing, and does something I don't think I've seen on any other ride: instead of moving 4 or 8 or 10 people in one car through a number of scenes quickly, you have (I believe) 6 cars of 8 people moving through the ride as a group, which means they can linger in each scene for a much longer time and still maintain overall throughput in the ride. This is something that's only been possible with the trackless rides, but it seems to make possible something that wasn't until now: letting you hear an entire song, rather than just a part of it!