I have the MX-23 and though they are forgiving they are not that forgiving. The cobra FP in my opinion are way more forgiving. I hit the cobras at a demo day for a good hour and I was really close to buying them. But i got a really good deal on my mizunos.
Before I had the mizunos I had a set of cleveland launcher LP. I could hit the crap out of every iron in the bag, now with the mizunos im replaing things with hybrids and its a pain. I may still go with the cobras because the price is awesome. But im also looking at Pings.. BUt thats another story...
All in all you need to hit them and see what you like better. I personally think the cobras are more forgiving, but the mizunos have an amzing feel to them on a good clean shot, but if you hit them bad, a nasty stings comes through the shaft....
Good luck!