it depends on how much you're bringing.
i had a basket set up for awhile with the riv sackville. i was bringing my office clothes, etc commuting. however, i found it was a bit too much space. when going around bars, i just needed to bring a u lock and it would clunk around in the basket. this was generally the case if i didn't pack enough in general - the contents would just rattle inside.
also parking the bike rack was a bit of a hassle if there were already a lot of bikes locked up, as the basket is in the way.
now i have a rando bag set up, since i keep my office clothes at work. so i just bring my lunch, some toiletries and a small towel.
if i go to a bar, i just bring a bungee cable, and bungee the u-lock right on top the rando rack.
i have a rando bag from ruthworks that is just the right size - compact, but big enough to be able to haul some groceries if need be.
I would highly recommend a decaleur set up if you stay rando. it makes the bag much more secure. it eliminates the need to use the bottom straps (which I feel take the most time). just need make sure the back slips into the tombstone while you put the decaleur in. i would also recommend shoulder straps, makes carrying your bag around much easier.