Best pull-ups?

Help! We are starting the transition out of diapers and my son is starting to ask to sit on the potty a few times a day. So we thought pull-ups would work better than diapers until he’s ready to go full-potty training mode. We’re kinda going with his flow on this. My question is, what brand and size works best for your LO? We’ve tried Huggies 2-3T and they seem really small.. So tried the 3-4T and it’s slightly loose. Not sure where to go from here, poop has leaked out of both 🤦🏽‍♀️ I’ve tightened the sides on the bigger ones but overall I feel like they don’t hold in poop as good as diapers. What are you all using??