If I couldn't get a MMr, and was limited to those choices, I would go with the Star Trek LE. The main reason for that is it's a great theme and since its on your list I assume you are a fan. I think the LE version of the Star Trek machine offers enough over the premium to justify the cost (this is debatable) for the following reasons.
1) Artwork, the cabinet artwork on the LE with the blue trim is beautifully done, couple this with the laser etched side armor and LED phaser lighting and you have a cabinet that was extremely well done.
2) Mirrored backglass; again, the artwork on the backglass is the best of the three choices for this title, of course this also depends on individual preference.
3) Features, this is where the main difference between the pro and LE come into play. The full LED playfield with RGB lighting really makes this title shine, Stern did a great job in this area. The LE comes with a shaker and a motorized laser that adds a big coolness factor to the game. Other nice playfield features like metal rails and a reactive Vengeance add to the appearance and enjoyment of the game.
Currently I am not purchasing anything newer than 2014 from Stern until they resolve their quality control issues, and I will never recommend any product that I'm now willing to purchase myself.