Aragon's focus is mainly on Board-level governance, while Colony is focused on the day-to-day management of tasks with a built-in reputation system to allow contributors to be rewarded in proportion to the value they provide a project while having reputation-weighted influence in the governance of that project.

How are you going to handle the growing inequality problem?

In every type of economy, inequality gap in wealth distribution tend to grow over time. In your system, you'll have the same trend with "reputation" or whatever measure of influence you choose.

For wealth, it’s probably a toughie, but for reputation it’s a bit easier because reputation decays over time. That means it’s impossible for an influence aristocracy to emerge. There will still likely be a power law distribution of influence at play, but it won’t be as extreme as it might otherwise be, and people will have to remain active to retain their influence.

I'm not sure it aims to solve wealth equality gap..

As I understand it, Aragon is a way for a traditional company to sort of 'blockchainify' itself, by putting board management, funding, accounting, etc. of a traditional organization into a dApp.

Colony is a really fundamental re-imagining of the way an organization works. Instead of being a normal company ported to the blockchain, a Colony is an organization native to the blockchain.