My Chanel woc hands down. Works as a casual bag and as an evening bag, the chain can be worn crossbody or on the shoulder (doubled up, full length, or shortened with a hair tie), and it is so durable and high quality. IMHO it’s also very pretty. It is my most worn bag, I’ve dragged it through almost every place imagineable and it still looks good. Not to mention I have a terrible habit of spilling drinks and my woc has often fallen victim to the spillage. No stains whatsoever
I think the speedy bandouliere is really versatile, I have the regular speedy and find it annoying to hand/elbow carry sometimes. Are you worried about knockoffs because you want to buy preloved?