I feel your decision on which one to get needs to start with the size room you plan to put them in. Both the 3.6 and 2.4 like to be spread wide, pointed straight ahead, not near any walls, and with the listener at least 8 feet away for the 2.4, and probably 9-10 feet for the 3.6.
The 3.6 will have deeper bass, but I feel the 2.4 does everything else better. The single unit midrange/tweeter eliminates a critical crossover element that makes the 2.4 a more well rounded speaker. The impediance curve on the 2.4 also gives you more flexibility with amplifiers.