The two are very different. Storj is more of a turnkey solution that is relatively mature and easy for a new miner to participate with low costs. FileCoin is still fresh and changing, but requires far more intervention as a miner to figure out how to effectively mine. Despite the recent launch of mainnet, prices and ROI are not understood. (Filecoin launched with a spike in trading at more than $200 now settling to ~$40 each.)
The network highly depends on people developing applications to interface with the lotus backend. Miners are expected to put up a significant investment in hardware and collateral, starting in the thousands of dollars and in many cases reaching millions. The big miners are heavily invested and reap most of the block mining rewards.
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