bumGenius 4.0. They have an amazing reputation, but their sizing was the thing. O at the time was still very chunk (he is still, but not as much). They say 35+, but the plus is what I'm always hesitant about; they could very well mean a pound or two. But I was pleasantly surprised. The rise is perfect (Ollie is now 32" tall) and it's on the largest setting. He has an inch worth of growth left on the velcro. I do want to try out the snaps to see how well they fit and how much growth or use he has in them.
I also like their hook and loop. I feel that it will keep going for quite awhile. If you have a chunky child you know that if they move around to much the hook will start to come apart from the loop. I have yet to hear that iconic sound of it coming apart while he plays. (TIP: I usually will put pants on O when he plays and wearing hook and loop to make sure that they stay on. But when trying a new diaper I leave the pants of to "test" out the strength of the hook and loop tape)
I also love how there is a folded down section of PUL on the inside of the diaper.
So for a chunky toddler I would buy more bumGenius!!