I personally prefer Satoshi, its way more fun to transfer a million satoshi than 0.01 btc or 10 mBTC.
No seriously, just use whatever you prefer, I think most are familiar with the denominations
1 BTC = 108 (100 million) satoshi
1 mBTC = 105 (100k) satoshi
1 µBTC = 102 (100) satoshi
Yes, and do you see what the common denominator is here? It's the satoshi unit, and that's one of
only two that should be used in my opinion. I strongly,
strongly believe that one should either use satoshi (or ksat: 100ksat = 1btc) or BTC. Everything else is unnecessary and only introduces more steps in describing what should be a very simple quantity.
Most of us have had training in science, right? Think of how many garbage units we have to deal with just to describe a single quantity. Back when I learned about the ideal gas law, there were so many different R constants because Pressure could be in torr, atm, mmHg; Volume could be in liters, CC, M^3; and Temperature could be in Celcius, Fahrenheit, and Kelvin. It was ludicrous and there are so many other examples of this it makes my head spin just trying to think about all of it again.
So for me it's Satoshi or BTC. Nothing else. Not Bits, not mBTC, not uBTC.