bankai

I guess we have seen these two superb attack, i just want to knw among the two attack which one is more suicidal?

Also pls state reasons. Mine is mayuri's since it summons a whole new creature which i find awasome.Andi fint its grostuqe-creepy look very awasome-cool.

*This pertains to the newest issue of the manga, if you haven't read it don't read below* So, Gin was lying to Aizen about his Zanpakuto's powers right? What I want to know is if anyone has any idea about his poison attack being his bankai or simply his shikai. Thanks for the help

In bleach what is the difference between a shikai and bankai? I know it has something to do with the Zanpakutou, lol thanks!