Dedicated 20 amp lines/should i use a sub panel

I don't think there's a big benefit, besides wiring alone, but there are some interesting options in terms of noise suppression and balanced power at the power panel.

Check with your electrician.

My electrician recommended a subpanel and I'm so glad I went for it. His reason was my main box was a mix of old and new wiring and I was hearing noise thru my existing line to my Hifi rig.

He knew what he was doing since now I have two separate runs with no metal staples used, with two Hubbell receptacles grounded at the subpanel. He also added a second 8' grounding rod.
There is absolute silence thru my speakers now, and I'm using all tubes. I was able to remove one of my power conditioners since the noise floor is so low.

 

I believe we need to hear from some of our more experienced professional electrical experts here on Audiogon (you guys know who you are).
I'd also really be interested in knowing if there is or isn't an advantage to using a sub-panel if there are openings in the main panel?
No offense meant to those that have answered above.
I also use a sub-panel in my systems.

@almarg @jea48 there are othres also...
A little assistance, please?

I will be running 3 lines all identical in length to avoid ground loop hum, my interest is will there be any difference... negative or positive...from running a sub panel as opposed to just using open spots in the 200 amp panel. the closest and farthest line will each power a REL G1 sub and the centre line will power a Synergistic Research powercell 10 UEF, which is where my  tube cd, tube pre and ss amp are plugged into. this is how my system is presently powered just not with dedicated lines.