It's been a while since I watched either, but to my memory Deleted Magic seemed more scattershot than Star Wars Begins.
Jambe began his film after he'd covered Empire and Jedi -- since ocpmovie had well-covered Star Wars -- but then decided to cover that film also.
So he seemed to have a better sense of purpose, a more focused approach.
If you watch both then I'd recommend watching Deleted Magic first. There was even a Revisited version, but again its description seemed interesting but scattershot and I don't think I ever watched it through.
And what I'd *really* recommend of ocpmovie's work is "Return of the Ewok": his reconstruction and preservation of a fascinating short film made while Jedi was filming, and hilarious. Turns out, memorably, that Carrie Fisher spent her time in her dressing room wearing her outfit from Jabba's palace.