In the same "looking for the right finsh" boat. If you are referring to the Stonsescape mini peeble finishes, the Tahoe Blue is quite grey on close up and swallow depths. The ever so slight greenish tinge will be less apparent the deeper the water depth (and time of day, etc); however, I have swallow depths and a spa so that overly greyish color of that finish is not for me. I do like the Tahoe Blue's textured look (not refering to the feel of the finish); if only it could have more of a greyish blue tone to it vs. a drab grey.
So I am leaning to the Tropics Blue; but my PB's recent tropics blue installs I have looked at were customized and a little to dark in the actual finish color - and as to the pool color as well. More posts than not have referred to the Tropics Blue as having a deeper, darker pool color look, and my in person look confirms this; however, I like the actual finish look for the up close shallow depths as the Stonescape mini pebble Tropics Blue does have a little more of the lighter, blueish grey over all color to it. Not quite as drabish grey as the Tahoe Blue.
Its a big investment...I'm taking my time choosing the right finish - meaning my pool (replaster) is standing prepped but empty while I pursue this quest. That finish is going to be with me for 15 years so I'm not about to hastily make a decision. My PB is cool with that, which is nice.
One final comment: Judging the pool water color from photos is going to be misleading. I have done a ton of seach online and seen Tahoe Blue pool pics with depper blues (and no hint of green); and I have seen Tropics Blue with a slight hint of green. (BTW, neither will have that green lagoon pool color that you get with a white laster finish). In one PB's web site that has a ton of the mini peeble pools he's done, he has 4 or 5 pools with the same fiinsh and they all vary in hues of blue. My point: If you can get to see the pool finish in person, that is the way to go. But not always feasible.