I started off buying only synthetic bags because I was afraid of wet down bags. Also, I solo-ed a lot and didn't want to be caught in the woods alone with a bag that wouldn't insulate. After buying 4 synthetic bags, 3 of which I LOVED, I gained enough experience to feel comfortable knowing that with proper attention and care during my trips, a wet bag wasn't the norm and so I ventured into the down bag arena . . . and now I won't buy synthetic again. Once you go down you never go back
I find down more comfortable and warmer at the same "rating". I have never slept in a synthetic bag at the temp it is rated for and been comfortable however, I have pushed the limits of my down bags to 3 degrees below its rating and been very comfortable.
Also, there is something psychologically warmer about down, it is just so puffy and cozy looking
If I was suggesting a bag for a beginner, I might still tell them to go synthetic until they figure out if they love the sport enough to commit more money but for personal bags, I will always buy down.
The above opinions are not based on a love/hate down/synthetic or on numbers and stats but on a completely personal and unhindered by data opinion by one user . . . me !!
I recommend Western Mountaineering bags, expensive but oh so comfy.
BTW, the original poster did phrase the question in a manner that would bring up the down vs. synthetic question so I don't think the re-hashing of that topic, however redundant would be off-topic for this thread ???