For me, the Dalaa would be off the table as it is not ILF.
The other two that you mentioned are both nice risers but they do have some design differences and it would depend on which one feels better to you. The Titan is a little more deflexed which some people find more forgiving and it is about $100 cheaper. (with the base glass-wood limbs, the savings is over $300) Also, if you plan to use an elevated rest, the Titan riser was designed to accommodate a stick on rest a little better than the Sky. The Sky has the Mathews style harmonic dampers which some people like, and comes in more colors. Both have lateral limb adjustment which can be important.
Overall, I think the Titan is a better overall package but it really depends on what features you prefer.