OXEN is a fork of Monero that uses proof of stake instead of proof of work and supports instant transactions. Lokinet (onion router, like tor) and Session (messanger) are build on top of it. I just discovered it a week ago and I'm suprised that I hadn't heard of it before. In my opinion It's a better Monero (except that Monero has higher and more stable price)? What do you think about OXEM? Is it better or not, and why?
How instant? Monero transactions can be seen in seconds (in the mempool) which is okay for smaller transactions. And 1-2 confirmations take roughly 2-4 minutes which is recommended for bigger transactions. So still pretty fast for real world stuff.
And what is your reasoning for PoS > PoW? I'm very curious!
Monero does instant transactions, visa is proof of stake. They are unrelated things with different uses in mind. I don't understand how you compare the two. What can you do with oxen?