What are your plans that day? Where are you coming from/going to?
I'm in the seemingly small camp that don't think Kona is a destination breakfast, and while I adored Boma and would happily rebook breakfast there (and have for our next trip!) I'm only going back because it's our AK day.
If you're staying at AKL or planning on going to AK after, I say go back to Boma. If you're staying on the monorail loop or planning to go to MK after I think you can stay with Kona. If you're planning anything other than MK/AK, I personally think Boma is the better of the two but IMO you could go either way.