That's a great question. I bought Tumblin's (similar to Tom's) and Krawlers Edge (similar to BC)... With the KE mounts, the engine was 2.250" lower which I liked, but I had to notch the frame to clear the headers and alternator. The problem I didn't like was the front diff pumpkin was only about 4" from the oil pan. I went with the Tumblin mounts which raises the engine up and you don't have the clearance issues. It does put the engine at about 7* which looks kinda funny but It's suppose to help with pinion angle.
There's a trade off for which ever route you go. There are a ton of little fitment issues you're going to run into, but it'll be worth it!
Here's my build thread which I discuss the motor mounts a little more.
Good built thread! I'm pretty much at the point you were a few months ago. I do like the higher mount option, but still debating. Great advice sticking with 1 brand for fitment.
You happy with using the POR15 on the frame so far, or if you did it again would you use something else?