I just learned that Surf is sending some of their U16-U19 players to train with the the Loyal Select their Youth Academy program of the USL. Good for those kids in SD!
Matter of opinion. MLS clubs will say go from MLS Next to MLS Pro to USL affiliate to MLS is a easier pathway.
USL Clubs will say go from USL-A to non-MLS USL then to an MLS USL affiliate then to MLS is another pathway.
I know players turning down USL-A options for an MLS Academy. I also know of players who have tried out for MLS academies U17 or U19 teams that did not make them but are starters at USL-A teams.