Dry 24/7 has been going through so many changes and actually denied the fact that their diapers were different with the last run I tried, they were changed for the worst. Someone did that the phase was over, but I got tired of the inconsistency.
Before the last batch, their diapers were amazing. They had great capacity. Then, during the summer I believe, the batches were just terrible. The plastic baking was close to sandpaper and weren't very comfortable. The padding fell apart like crazy, the capacity seemed like it was cut by more than half. The only good change were the much wider tapes, that they denied making changes to at all.
As for the Northshore brand, they are a solid diaper, but they didn't fit me well. They weren't as good as Dry 24/7 in my opinion before those changes were made. They are better than Abena.
As for the sitting factor, I have a lot of experience in that, as I am a truck driver. The Dry 24/7 worked well before the weird batch, however, the ones that I currently possess leaked quite quickly on me.
North shore should get you through the 4 hours, but if the fit isn't correct, you will leak. I have a 38in waist. Mediums were too small and larges were too big and I couldn't really get a good seal through the crotch.
I would suggest getting ABU's Simple diapers. I highly recommend these. If you wear loose clothing, you really can't tell, and the don't crinkle as loud as Dry 24/7. I can sit a long time with use and not have a leak. I sit and drive for 10+ hours a day without a change. They are much more comfortable as well.