This will be quite long, but I'm going to copy/paste a couple of posts I've previously made elsewhere in similar discussions to lend some perspective. It's very easy to get the wrong quilt for the wrong reasons. Based on comments I've seen repeatedly online, I think people's experiences, particularly first time quilt users, could have been better than they were had they made wiser choices.
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I'm not one to try steering someone else toward one or the other, but I'll give you my "bag vs. quilt" perspective, because I like a lot of room, too, even though I'm more of a back sleeper lately.
I currently(and for >5yrs now) use a size 6' Wide Katabatic Palisade quilt. If I had to replace it tomorrow with a bag, it'd be either a Feathered Friends Kestrel UL($469) or Western Mountaineering Megalite($470).
At today's pricing, a 900 fill 6' Wide Palisade + my Goosefeet hood is going to total $485, or $490 with optional 900 fill Hyperdry.
So while there's no real price difference with a premium bag of comparable quality, in this case the quilt actually costs a bit more when you add in the price of the hood.
The quilt + hood is going to weigh 21.5oz. The bags are listed at 27 and 24oz, respectively(Kestrel shown as 3oz heavier than the Megalite, but with 3.7oz more fill).
So there's no major weight difference, either.
Both of those bags are wide models with a shoulder girth of 64" vs the standard versions' 59-60".
My Wide Palisade has a width of 58" at the shoulder. With the edges secured 4" apart underneath me, it has the same girth as my 62" mummy bags, which is about as small as I'd want to use.
But the distance between the outermost baffles of both my Exped mats, and where I actually attach the quilt most often, is 14.5". I'll usually draw the sides in more in sub-freezing temps, but that's a girth of 72.5".
And that is a big difference. Very roomy.
On the quilt questions:
No, I don't miss a bag, and because I went "oversized"(I'm >50" at the shoulder, but just under 5'7") and got a quilt with a list of performance-enhancing features that include an effective pad attachment system, I do not feel it has any disadvantages.
I think the problems most people have with quilts is that they bought the wrong one for their needs. Like getting a quilt that is too small for the sake of minimizing weight. Or one that isn't as warm. Yeah, my 30F quilt weighs 3oz more than some competitors. Probably something to do with being 3" wider and having 2oz more down.
I could use Katabatic's size Small(5'6") quilts in their regular width, and know this because I have a 50F summer quilt with similar measurements. But I also knew when I bought my Palisade that I couldn't stand drafts, wanted room to move around, and that it was going to be used at temps much lower than its rating with a down hoody and other layers.
So I bought the 6' Wide instead.
The weight difference between those sizes in a current Palisade is 3.8oz.
The second night I used my Palisade in the field it was with supplemental layers at -2F, and I was fine. Obviously, a 30F quilt is not intended to be used at that temp, but I did the same kind of thing with a sleeping bag before, and the point is that the fact it was a quilt was not a limiting factor.
All that to say if you decide to get a quilt, make sure to get one that has the features and sizing appropriate to your expectations, so you don't become one of the people who were disappointed because they didn't. I read some of this stuff on the internet, and often wonder if the quilt isn't getting blamed for operator deficiency.
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If you do try a quilt for low temps, a good pad attachment system, and enough width to completely encircle you, aid in eliminating drafts. Some people are of the opinion that a quilt gives up warmth relative to a bag of equal loft, etc. That may be true due to inadequate sizing and setup, or just inferior design, but it doesn't have to be.
There's going to be some fiddle factor with a quilt, and you'll probably want a separate down hood to go with it. Quilts attached to the pad really shine for active sleepers who twist around a lot plus end up breathing into their bag since those same "compromises" become advantages. That's one of the main reasons I decided to try quilts, and they worked out great for me. Now that I've become more of a back sleeper, it doesn't make that much difference as far as comfort, but still saves a little weight.
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