Diapers recommendation

Hi! Previously my son was using Offspring.. All good, no issues just that its quite pricey.. So i changed to Merries (recommended by many & pocket friendly too). But i dont think its compatible as it leaks 1.5hr after i changed him. Tried Huggies Nature Made samples, he had diaper rash. Anyone faced the same issue? Should i give it a try again?.. Or any other brands to recommend? Also, when he's on Merries, he smells of urine unlike Offspring. Is it normal? TIA! :)