Anyhow, depends on what kind of Sin you want to play. If you intend to farm bosses then go A/E. You want Wild Blow and attack speed stances, go A/W. etc
A/W is what I did and got through most of the game fine.
I switched to A/Me at senjis so I could do fow/tomb solos...and haven't switched back lol.
But A/Me isn't effective until you get Shadow Form so I recomend A/W
wow you obviously have absolutely no idea what you're talking about. BoA = 5 seconds which is more than enough time to unleash a combo.
Flail = trash - 33% reduced speed? on an ASSASSIN? No way would I bring flail instead of BoA.
And also why the hell would you wana be auto attacking on a 'Sin? You wana go in, quick spike, the leg it out of there. Which means you shouldn't have the time to build up adren for flail.