Frankly,I'd go for the Depth...or the Descent! The Grotto lacks the punch of a Depth and although it may be more expensive, it's definitely worth it.
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It all depends on your room size and your listening preferences.
Martin Logan makes a fast and accurate subwoofer. Nothing replaces moving air to feel your listening room with bass. Tricks to make small subwoofers sound large only muddy the sound.
If your room can take it, go Depth . . . . my new listening room is larger than my previous one and that is the direction I am headed. I will match the Depth to my Thiel CS 1.6s and expect to have a natural musical experience.