Low tier MD (PHSU) vs Established DO program

Sorry if this has been answered before, I just don't see a concrete answer. What is the main difference between a low-tier MD vs a DO program? I know there are many differences such as OMM and complex boards, but I am asking specifically for residency/matching purposes. Now that there is an MD-DO merger, what is the main difference between such?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Help Me Decide: X vs Y Medical School Source Type: forums