I am a fan of the 14x6 for general flying with a 91 four stroke.

Master Airscrew now has a 14x6 in their "Scimitar" line, which I have on my Big Stik 60 with OS 91 four stroke. It has less flex than the K series if that's important to you.

Since the only 14x6 APC makes is labeled "pattern" I doubt there's much significance, and if you want APC it's your only choice.