Heavy metal bars will have a lower L/D than carbide. They will chatter sooner than a carbide bar but there are frequency stability nodes to any setup.
It's not just a density thing and I've seen plain ole steel do 12:1 24 hours a day.
In volume production there are all sorts of tricks, different deal for a smaller job shop environment where you can't afford the testing or playing time.
The tuned bars from U-dex are made under a patent license from a big giant tool company. They paid big dollars for the rights to use this tech.
I was told that it took 4 years of production to begin making money off this product line.
Also, please, please don't get married to nailing centerline height here. Often above or below runs better as it changes the rake/clearance angles.
OD and ID, there is only one line that counts and it is from the tool tip to center of rotation. Facing, yes you have to rid of the center tit.
I look, taste and smell an op and tool wear and then tell people to raise or lower the tip 0.030-0.250.
They look at me like I'm a crazy man yet what I am doing is making their catalog standard holder into a custom rake holder designed for their cut.
You can't use this trick if you have to finish to center the bottom of the bore but it is cheaper than buying a custom bar with the right angles for your job.
The basic choices are steel, heavy metal, carbide, tuned in that order. Also that is generally the pricing order.
Don't buy more than you need.
If it was easy or simple one size fits all rules it would not be fun.
Bob