I've seen both in action, but haven't personally used either. From my observation, the Misfit Pearl (I'm assuming you are saying the Yellow "new" one) is a little earlier (maybe by 2-3 feet, depending on drill) and a little more "rolly/control" on the break.

The 400A SE is a neat piece; clean up front and in the mids, but rolls extremely well when it encounters friction.

Both balls have exceptional carry, but the 400 overall seems to be a little more "user friendly".......... whatever that means. I'd be interested in throwing both side by side but if I had to pick one of the two, I'd go 400 A by Track

(I've got 2 DV8 balls-- original Marauder, Endless nightmare---- and had three "new" track balls; 508a (would have rolled better with longer drill angles, 716c, great OOB, altered surface and never got it back to normal, and my favorite, the 503t)

Can't promise that you will find it as such, but that's my observation at this moment. Most people I see using the 400A are trying to use it on fresh house conditions....... which it isn't meant for--- well, neither is the pearl misfit, but I digress.

I think the pearl misfit is a little more "rolley" than the 400A, which to me, means forgivable and area. You may find it does or doesn't offer such qualities, but at that point, play with the surface and multiple lane conditions. Remember, just because a ball doesn't "fit" what you thought it would do, that doesn't mean it can't find a place in your bag.