From Magento itself, there is none, however it is so widely used, nearly every problem has a community solution, and people like myself offer support rates at very competative prices if there isn't a community solution available.
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Apart form Magento being a resource heavy it trumps prestashop in nearly every area for any serious business, sure if your a small shop selling 5 items, presta is going to be easier for you, but in the long run the massive capabilities and customisation in magento just dwarf any other platform.
Put forward to me your best arguements for why Prestashop is better than Magento and we can discuss it, but the only arguements I see are from lazy people (not saying you are) not wanting to learn how to use Magento properly, and claim its too hard.
The situation is similar to sage vs other accounting software. People claim sage is too hard and bulky... well it is the best accounting system out there... hands down, but people bash it because they don't want to lean to use it properly.