Should I roll for bankai Ichigo or just use shikai b6 for slash for the meantime

I got very unlucky with he rolls and all hard pity, got urahara and yoruichi after 5 days lvl 32 acc I didn't bother with the classic gacha reroll acc but I did get urahara character and weapon stamp which is kinda lucky I guess. My shikai Ichigo is also a lot of fun especially when the blade is enhanced where ever attack and technique spin release a getsuga, anyone know how far apart is bankai b0 bankai vs shikai b6?