Balanced vs RCA preamps

My Linear Tube Audio MicroZOTL tube preamp has one balanced input. The rest are unbalanced.  I asked LTA if there was any benefit to using the balanced input. They said it would depend on the strengths of the connected device. My dac has both balanced and unbalanced outputs. 

I'm using unbalanced because my best cables are unbalanced. 

For me it was more about flexibility. I like having both because not all power amps have both. Also, I'm thinking about getting some high-end active powered speakers. I can use my existing preamp to switch between my powered speakers and passive speakers between both sets of speakers without changing cables. Balanced cables are supposed to have a lower noise floor especially for longer runs but I think in reality it doesn't matter that much for the average audiophile.

When using XLR connectors be aware that Japanese audio manufacturers use a different configuration for pin for ground.  

So if using say a US made pre-amp with a Japanese amp you need to make sure they are using the same pins for ground.  Accuphase amps have a selector for this.

Rogue Audio has tube preamps with both RCA and XLR outputs.  I have the RP-7 that has two sets of each, and I believe the RP-9 has the same.  I am quite pleased with sound quality achieved with my RP-7 and my Odyssey monobloc solid state amplifiers.

Spatial Audio Lab Raven Preampr Has some of each.