Neither are hot off the press new baits, but they have a significant following for deeper cranking.

 

Looking at the "Series" baits vs the "XD" series, the XD's are rated slightly deeper.

 

Any other differences and benefits or drawbacks of these two series?

4 vs a 4xd for example?   Same body, just deeper diving on the xd

1 minute ago, webertime said:

4 vs a 4xd for example?   Same body, just deeper diving on the xd

Yes, exactly!  I thought both the bodies and lips looked very similar in packages side by side. 

 

Quick look - they look like the same bait!  Maybe I was missing that the lips are a little different.

 

I assumed there had to be a reason why the xd dives deeper and I couldn't see where that was explained.

Body is the same. Lip is deeper diver. The majority of the XD I throw are 3XD. My patterns I have in the Pro 3 and the 3XD to get me deeper. I do like the Strike Kings Pro Models in that size range. 

Yeah what these guys said ^^^ lips are thinner towards the end so they cut through the water better. I think some might have a little curve to them too.