devs and experts only please.... POS3 and POSP are these the best yet of POS?

[cryptohunter]

Let's not get into a pump discussion of particular coins. Let's just discuss the tech.

POS3 (rat4)

POSP (elambert)

These are the best yet of the POS systems?

What are the pros and negs of each vs each other or vs vanilla POS.

Also what are the advantage of

POS + POW  vs Pure POS of any kind.

Are their other variations that are as good or have advantages over either of these?

Let's not just hear POS is trash compared to POW. That is not the discussion here. I would like to see if anyone knows which of all the POS variations is best and for what reasons.