I have 2 of each. I have another treble case on order, and I just ordered 2 more imsto cases, if that tells you anything. I love them both equally. If you want to complete your poker build quickly, you can't go wrong with an imsto case. But the treble case is also worth the wait. So there you have it.
The imsto cases are anodized, and the colors are very nice. I have a red and a blue currently. It comes with nice metal feet, which attach to the case with screws. And it includes a mat to place under the PCB for protection.
The treble cases are powder coated. I could not have my jdcarpurple case any other way. The finish is very well done. It comes with rubber feet which elevate the case just enough for my taste. It also includes a laser cut plastic sheet to place under the PCB for protection.
That is my brief review of both cases. I wish I could recommend you one over the other, but I just ant pick a favorite. Sorry.