Southampton are and were a Premiership team having a blip, whereas Bristol City have only spent two years in the last decade outside the Championship - it also helps when you're backed by a billionaire! They paid £1m simply to loan Tammy Abraham from Chelsea this season!! £1m loan on an 18 year old is crazy.
Bournemouth did very well, not only to get promoted but to also stay there. However, they quite ridiculously flaunted FFP rules and have been hit by a big fine. It's all well and good performing well in a tough league such as the Championship, but if a team is cheating and playing to their own rules then it's not quite such an impressive achievement.
Burton on the other hand, they're a team to really admire. Their rise over the last few seasons has been incredible, and I'm very much looking forward to the trip to. Burton have also had two of their managers poached by bigger teams in the process. At the same time, they've had their distinct advantages over their competition since they entered the football league. Where many lower league teams possess truly awful training and sports science facilities, Burton train at St George's Park and therefore have access to some of the best facilities in Europe, and that naturally attracts better players and staff. Also, for that reasons, they're a great team to manage of Football Manager!