The main differences are:

• Publish0x doesn't have it's own token or blockchain - it gives out many different tokens (right now: BAT, DAI StableCoin, HYDRO).
• Publish0x also pays out tokens to readers, and it does not matter which articles readers choose to tip... the reader can always keep a % of the tip, which is the same no matter how well the article does on the platform, so there's no "curation" element to it, or the "hunting whales" element either.

So it's a bit different. It's simpler to use, and more focused on crypto based topics than Steemit.