Which 15 inch macbook with USB has the highest repair score?
iFixit.com has an entire blog about repairability scores:

Laptop Repairability Scores



It's sorted by score from highest (easiest) to lowest (most difficult) or by release date (most recent first).  It includes all makes and models, not just Apple, so if you're looking for an Apple centric list, you'll need to extract the data manually.

IMO, this is an exercise in futility.  Why?


MacBook Airs from 2012 have not only soldered in RAM, but the drives are proprietary making them expensive.  These are the only ones that currently (as of this writing) have SSDs that technically can be upgraded.
MacBook Pros from 2013 on have soldered in RAM and proprietary SSDs as well
2015 MacBook Pros are the only ones with a removable SSD and without the problematic butterfly keyboard
After 2016, you're getting the butterfly keyboard, soldered in RAM and SSD and USB-C


So, if you want high repairability and no USB-C, you're looking at a 2012 model which makes it 6+ years old (soon to be obsolete).  Every manufacturer is going USB-C/Thunderbolt 3 so it's much more economical to just bite the bullet and get a dongle.