A good effort.
Rather than be completely negative, these are my neutral opinions.
Flow: Fat Beats 10, Heavy Urb: 9
Fat Beats was more consistent emotional and technical, but I had appreciation for Heavy Urb's attempt at variation of cadence. The main issue I had with Heavy Urb is that there were some really awkward plugs that made it sound like it wasn't done in one take. If you're going to do plugs, it needs to sound consistent with the previous parts.
Attack: 10-10
The first verse goes to HeavyUrb because he focused in on FatBeats where FatBeats was talking more about himself in the first verse. I understand it's hard when you're starting a battle, but you do the research and hit it from jump. The second round FatBeats stepped up with the rebuttals and put Heavy Urb on the defensive, and some of his responses weren't as powerful as they could be.
I get that "playing the reciprocal" means he's a pussy, but it just doesn't hit quite as hard as it needs to.
In summary, I've gotta give this to Fat Beats. I feel like overall both rappers would improve by really focusing on hitting every beat instead of just getting through the line and then being on beat for the last rhyming word. I'm not gonna worry about production quality. We can't all afford home studios.