The rebuilt engines have a reputation such that I would avoid them, unless you rebuild it yourself. The brand new, Mopar non-MDS long block from Modern Muscle Extreme or Brian Tooley Racing, is priced close enough to the reman units to make the question more of a question of New vs Used.
https://www.modernmusclextreme.com/p-942-57l-hemi-non-mds-truck-engine-long-block.aspx
BTR GEN III HEMI NON-MDS 5.7 CRATE LONG BLOCK & SWAP KIT Get a fresh factory assembled NON-MDS 5.7 liter Gen III HEMI long block and choose the parts YOU need for a complete installation to your platform!
briantooleyracing.com
I'd go new, Mopar non-mds, unless you can find a good deal on a low mileage used engine.