I've just finished all the SG series (SG1,SG Atlantis then SG Universe). To my opinion, SG Atlantis is the best,with lots of action,I liked the casts, some humour here and there. All of these made me to keep watching from 1 episode to another the note,McKay sometimes really annoying).
Sadly that the producers decided to end the series on its 100th episode (season 5).
SG Universe is the most boring of all the SG series.