Eagle life thread touches on this often. We can only give you HINDSIGHT, since it is a new base for the EMB. LATELY a ton of new hires have gone there, since people already here typically could not uproot their lives to move there. HOWEVER going forward, once filled, which they are close to do doing, it might become more senior, because its better than living in NY/ORD (arguably).

RIGHT NOW EMB MIA is more junior than ATR MIA, but it is only because they just opened the EMB base. Once things stabilize that will change. If you go there as a new hire on the EMB, you will be on the bottom of a fairly junior pile, since 50-75% of the FOs there have been hired Mar 2010 or sooner.