An AT or EK would almost always be better making a weapon attack in those circumstances.
Yep. I like the IDEA of Poison Spray, but in practice? Ideal scenario for a Poison Spray is lots of very weak enemies crowded into a very small space. But pretty much nothing is vulnerable to poison and 1d12 isn't even enough to reliably kill goblins. And in 5e as written the early levels fly by in a couple of encounters, and by then enemies are tough enough that it's pretty much useless even once it adds another d12 at level 5. My dragonborn paladin's breath weapon is in a similar situation at level 5. 2d6 damage for a couple of enemies, with a relatively easy save? When even minion-types are heading into the 20-30hp range? Two greatsword attacks are much more reliable, unless the target has an appropriate energy vulnerability.