Quality AR's don't have receiver wobble, even if they do a 10 cent o-ring in the right spot solves that.
Accuracy is on par with an AR (seeing as it is just an AR with a monolithic gas pistol upper)
The same muzzle brake can be bought and installed on any AR or rifle alike.
I don't need any tools to strip down and clean an AR.. and the parts washer in the gun smith shop at works makes it even easier.
People say gas pistons are cleaner in the receiver but it isn't exactly true. If you want more of an explanation look up the interview with Noveske on why they didn't want to waste time building a gas piston upper. You can also look up SWAT mag's article on BCM's Filthy 14 rifle to see that DI isn't as scary as some may think.
The BCG is robust which means more recoiling mass.. which in turn makes for more felt recoil.
As for well balanced and heavy... I would personally say shares those attributes with the AR.
Best is a subjective term... when laying the hands side by side... a quality built AR will do everything a SCAR does, and a SCAR does nothing better... and I only spent less than half the price tag of the SCAR... which left me with more money for magazines, optic, and most importantly ammo.
I have no problem with the SCAR, I just feel that some over glorify it, when really its another AR copy, with a gas piston and monolithic upper, plastic lower and plastic folding stock. Also the SCAR comes with a thinner barrel, but I will say not everyone needs a grenade launcher mount.
The SCAR will always be in the shadow of the AR just based on accessories and versatility alone. A lot more calibers and configurations that you can practically change out in the matter of seconds will always make it( the AR) the more popular platform.