Well, I started out with a Colt Match HBar in the prehistoric days. I put on a Lone Star Ordnance pistol grip, a Redfield 3-9x scope and a Harris bipod, but it was otherwise stock. Then, during the dark ages, I bought a Bushmaster M4 upper, an EOTech and an M4 stock and remodeled the rifle into a fighting carbine.
Now that we've emerged from the dark ages, I ordered a Mega lower from Ameetec and as soon as it arrives, I'll return the Colt to its original fixed-stock glory and still have a nice carbine.
If I could only choose one configuration, I'd stick with the collapsible-stock carbine, but I'm eagerly looking forward to once again having a full 20" heavy barrel rifle with a fixed stock and a scope. It'll feel like having the best of both worlds. The HBar will be a target & hunting rifle. I believe the fixed stock belongs in that role, both for practical and aesthetic reasons.
I see a 9mm carbine somewhere in my future, but I have a tendency to prefer a compact and agile weapon, so it will certainly get a telestock -- hopefully a Magpul M93A -- and will be an SBR some day for the same reason.
So even though my preference is toward the compactness of the collapsible stock, there will always be a place in my safe for a traditional full fixed stock rifle and I'll love them both equally.