>>Magento is the Drupal of the eCommerce world - relatively prominent, but almost universally reviled by developers and not all that easy to use for users. It's the worst of many worlds.

This a thousand times.

I've used both and as a developer it was incredibly painful to customize either for any specific feature or function. The first time I upgraded Magento, it completely broke the client's site. A nice Sunday afternoon was spent hacking together plugins to fix what the update broke.

Both are horrible to work with and I shudder anytime someone suggests it to me for their ecommerce platform. You'd be better just hiring a .Net developer and have them build you something from scratch.