trying to decide what to get.
pro's vs con's of both
I just know there will be a flat spot when you remove the stock flapper valve.
what do you think?

Full. weee

Get a full system for the Honda. If not for the weight savings alone. It's like 15 pounds lighter.

If you had another bike with a stock full titanium system, I would say to get the slip-on, a race filter, and a custom map.