sounds like we have 2 schools of thought here:
1. get OEM rubber motor mounts. They absorb vibrations better although they may need to get replaced after a few years.
2. Get polyurethane motor mounts like
Sasquach recommended. They will last forever.
You can get OEM mounts at rockauto.com or at NAPA.
If you really want heavy duty polyurethane mounts try MORE Bomb Proof Motor Mounts.
Jeep Motor Mount for CJ-5, CJ-7, CJ-8 with AMC 6 CYL.Engines
You just have to decide if you want to spend $10 or $213
Well, the thread asks what the best motor mount is. I'm not sure $213 is worth it. Most of that cost is for the steel that replaces the OEM mounting. If I needed motor mounts I would go with the
Sasquach recommendation.