Submitting papers to a conference

I'm going to submit two papers within the coming weeks. I'll be proposing two new architectures (one new architecture in every paper).

The first paper improves all of the criteria and also enhances the overall results.

The second paper enjoys the same improvements in the criteria and it additionally enhances one criteria further than first paper; however this further improvement causes the overall result to degrade (I've not calculated the degradation amount yet).

I was wondering whether it is ethical and of any academic value to submit both papers or I must just submit the first paper?