as a ex chad user he def better i had him until my 100s until i got starrk more balanced than yachiru he is nice in pvp and better than yachiru in pve when u nd a van.
Chad is way better than Yachiru. If you are f2p and have trouble stacking gold reishi, keep Sado until you get H. Ichigo. So you can spend your gold reishi for a better partner (Byakuya, Tousen, Kyoraku etc)