I have both. As well as: Fogger v4, R91 and various KFL's.
The HCigar Aqua outshines them all. But it is designed for dual coils and it only holds ~2ml of liquid. The Squape, like the Aqua requires no tools for refilling or re-wicking, but holds nearly 3 times as much liquid (the remaining quantity of which is clearly visible). I think the Squape is perfect for an RBA newb, which is why I gave mine to my brother, but the Aqua is such a little beast. Both atties will take 3mm ceramic wicks easily having large enough wick channels, and this design feature -- wick channels-- is mainly why I prefer the Aqua and Squape over the Fogger v4, KF's, and even my beloved R91.
With regards to the Fogger v4: I am not a fan of its unprotected glass tube which is press-sealed by the top and bottom caps (instead of the older Foggers whose glass tubes slide over the O-rings). Plus, mine just never seemed to seal itself perfectly causing intermittent leaking/weeping down the sides of the glass.