I have swung both. Old Stamp felt like it opened up in a lot less swings the Autism continued to be stiff after about 100 or so swings.
If you’re looking for a similar size, look into the CXN, 13” and loaded.. these things are super slept on performance-wise. After about 50-60 swings they really open up. I’m sure they’ll fall into the same category as any other newer Easton where it may not pass after a fun hundred swings.