Storm is a framework for coordinating computation. It's not really designed to "perform automated tasks for you online" - although of course you could make it do that.

If you want to run a machine learning algorithm on 100 machines then Storm is what you want. Want a service to check the weather for your location? Huginn looks good.

Storm doesn't naturally support dynamic topologies and is rather resource hungry, which needs a bit advanced planning. I was looking @ Storm for my own pipelining product (bip.io) very early on and shied away as too high an opportunity cost for self-hosting users/devs to be bothered with. On a Rasberry Pi for example, forget about it. Without being able to create dynamic graphs it otherwise just ends up being a simple message bus (anti-pattern).

You are right that Storm is certainly more robust for large amounts of data. But Storm just provides underlying infrastructure. Huginn builds on top of something like that to add different agents for twitter, weather etc. So afaict, Huginn is an app built on top of something like Storm.