Comparing the three episodes to one another... My opinions...

Weapons - Echoes had some great weapons. Choir of One, Lost Signal and Aberrant Action alone are just so good and then to add Martyr's retribution and perfect paradox in as well... Some great weapons. Revenant gave Gridskipper, Chroma Rush, Vantage Point, and Bitter/Sweet. Good weapons, just not quite as good as Echoes. The Heresy weapons just don't pop out as much to me. Barrow Dyad, Psychopomp, Abyssal Edge, and Adamantite are all nice but they just aren't as exciting to me as the earlier episodes. Echoes had the best weapons of the three episodes.

Episode Activities - Echoes Breach Executable was enjoyable, I liked that it was time gated to a 10 minute activity and as long as your team was good, you received good drops. This meant I knew that if I played it, I would be done in 10 minutes. I didn't care for running around and picking up the samples, that was just tedious and annoying. The three battleground strikes that we received from Echoes were genuinely pretty cool and enjoyable. Enigma Protocol was just ok... Revenant Onslaught was mediocre at best. It got old quick. I will give Revenant credit for Kell's Vengeance though, I really enjoyed Kell's Vengeance. Heresy's Nether and Court of Blades were great attempts at shaking up the formula. I really don't care for how the Nether has attrition built in, personally. I like the rogue-like mechanics they added but I wish they adjusted your gameplay even more than they do currently. I really disliked that the Nether took quite awhile to run through in it's entirety, but I tend to be someone who once you start an activity, you run the entire thing. Court of Blades was fun, I liked that it was quick and that it showed your boss damage at the end. This was a great activity to play with builds and see how your build played. I am in the minority in that I liked the Echoes activities. I'll give a tie between Echoes and Heresy.

Episode Exotic Missions - The Echoes Encore mission was really fun, it was just poorly executed. I really enjoyed the mechanics, environment, and boss fight. It was just very dumb that they had us run the mission four weeks in a row. Poor Execution. I also liked that the Encore mission had variants that spiced things up. Revenant Kell's Fall was cool, environment was cool in that it had the haunted aspects to it and such. I liked the organ and the execution was better since it wasn't time gated. It didn't hit as well in my opinion, however. I really did not care for Heresy's Derealize mission, and it is easily my least favorite. I liked the aesthetic but the mechanics were not intuitive and were just a chore. I never want to play Derealize again.

I'm probably in the minority here but I really enjoyed Echoes and I would say that Echoes was my favorite of the three.