Some of the best ABDL diapers I've tried are ABU Little Pawz, ABU Super Dry Kids, Bambino Diapers.
I haven't tried Rearz diapers but I hear they are good thick and absorbent diapers and I hope to try them soon.
Bambino diapers were the first ABDL diapers I tried and I love them and I still love them and wear them sometimes but mostly I wear ABU Super Dry Kids diapers as they resemble the old style thick pampers.
Although not an ABDL diaper the Northshore mega max diapers are also good thick and absorbent diapers.