I have Alva AI2 & pockets.
AI2 - you still have to stuff but the insert snaps into the pocket. They have a double gusset for poo catching.
Pockets - just stuff & go.
I prefer the basic pocket style, too many snaps give me the willies lol!
I bought bamboo inserts from Alva, I've heard their bamboo charcoal ones are good going to try those next.
As for poo, We've not had a leak yet. Exclusive BF poo I scraped into toilet with a cake scraper I kept in the toilet, didn't rinse, just washed every second day. Once DD started solids she started doing rolling poos, just flick solids into toilet & wash every second day. Although not all baby's do solid poops I'm told!