In the rare case they might crack or break, which is just that, rare, you can easily round off the edges or points with a file and some sandpaper. Out of about a dozen or so kydex holsters I currently have and use or others I have had, the only one that has ever had the issue, was the one in the pic.
You'll never know just how comfortable they are or arent, until you try one. Talking about it here, just wont get it done. You'll just have to pony up the money and figure it out for yourself. Like I said earlier, they both feel the same to me (assuming proper time of year and conditions), so I really doubt you'd notice the difference. Both are shaped to the gun, and both imprint on you, just the same, and if anything, the kydex are often smaller in that respect. If youre not accustomed to carrying IWB, both will feel uncomfortable to you, until your body acclimates to the gun being there, so both will feel off until it does.
Luckily for us these days, we now have plenty of choices and types to choose from to solve our problems. There was a time, when we werent so lucky, and the choices were few, especially if you carried something other than what was fashionable, or you wanted something that was a little more "radical" at the time, and you just had to make due or modify things the best you could to get them to work. Now you can pretty much get anything you want, and off the shelf to boot.
Pick what suits you and youre lifestyle best, and you'll probably be fine. Truth is though, you'll never be happy, and you'll try everything new that makes you all warm and fuzzy, until you get it anyways. Just like what rides in that holster, the holsters themselves are also a sickness, and I believe we all got it pretty bad.
That said, you have two choices. A big "holster" box, or EBay, Gun Broker, etc.