Of course you can differ but let me explain what your points lack.
- Burst coin is a proof of capacity, wasted bytes filled with trash data that is nothing more than a set of hashes to prove it's you. SiaCoin and Storj both store user data and reassemble it creating a true decentralized storage/cloud system.
- Burst does move, but it's controlled by a select set of individuals, the entire buy book on polo is sub 50BTC. Compare that to the buy book of Sia for example, 420BTC, more than Burst has EVER had.
- Burst is the easiest to generte coins on, you are correct. The AIO wallet @lexicons version makes it very easy to get up and running in a couple of clicks. The others require time for contracts to build.
Time will tell ;)
Siacoin is more wasteful given it mines via PoW