Well in my case, bitcoin is my most favorite coin. I just love bitcoin so much, the rich history it has from when it was almost nothing then became big, then sank and got back up and became better, i love the concept. I love the goals/visions of satoshi which is something that i also wish would happen. So i choose bitcoin out of all other currencies. But in terms of trading, i would also go with promising coins. But then again, my loyalty still goes for bitcoin.