Having grown up in Canberra Australia, which is the roundabout capital of the world, the 4 way stop is infinitely more civilised...get there first, and it's your turn.
The roundabout can be manipulated to give preferential flow to posh rather than feeder suburbs...we had one intersection where a posh suburb had to give right of way to 4 feeder suburbs onto one of the main roads. Usually 4 cars waiting for a gap.
By installing a "fair" roundabout, they ended up with two streams of traffic banked a half mile back, and the posh suburb cars would sail around, one now, one in 10 seconds, another in 12...always moving, and the feeders always blocked.
IF you make the roundabout large (like Bathurst has recently done with their new arrangements, they ARE fair...but if you take a typical suburban situation, the planners can and will use them to suit their more affluent subdivisions.