New TT : Balanced vs. Unbalanced Connection?

Right question, wrong reason. You need to find out for yourself if induced noise from unbalanced interconnects is objectionable to you or not. 
 

That aside, unbalanced (using one of the signal conductors as the signal ground for the other signal conductor) is not best practice. Take the way the headshell wiring brings both signal conductors for each channel through the tonearm tube that is grounded fo the phono stage chasssis (not the turntable chassis). Using shielded twisted pair preserves and extends the tonearm tube shielding all the way to the phono stage. 
 

Oh, and one more thing, phono cartridges produce a differential signal that is not referenced to any ground, so the signal is neither balanced nor unbalanced, but it works best with balanced interconnects. 

Here is some information from the pro world.

To tag onto  what @gdnrbob mentioned. I recently bought gear that is truly fully balanced. This is the best solution for when you need to run long cables. The mfg. (Atma-Sphere) also suggested I convert my Rega P6 turntable from RCA to fully balanced. I did it it and it’s awesome- quiet and sounds great! I have their tube pre with tube phono stage and class d mono blocks and loving it more every day! In case you haven’t already, I suggest you read up on the posts from Ralph @atmasphere. He has lots of good posts that explain the interesting tech side of truly balanced vs just XLR and not actually balanced.

Used to have a fully balanced system, IMO balanced removes some of the noise that gets in the way of the music. Highly recommended. And don't let anyone tell you it's only about long cables. True or floating balanced, both work

I have a balanced connection from my VPI Titan to my Van den Hul Grail SE.  In fact, my entire system is true balanced and connected with XLR.  I’ll never go back voluntarily.

An MC cartridge /tone arm set up wired balanced (technically called “floating”) has consistently less noise, even over a short span.  There are side-by-side tests by Pro-Ject (admittedly pushing its balanced units) that show this, over a short 1 M distance.  You cancel out that first bit of noise.

To me, the most important signal to reduce noise is the phono stage.  It’s the weakest and most vulnerable connection.  Any noise there is merely amplified as you go along.

There is a reason why people say the most critical links in your system are your speakers and your cartridge.  Neither is the place to skimp.

So my strong recommendation is to go for it.