I really like to use StarSan. I keep it in a spray bottle, along side a spray bottle of k-meta.
For things like spoons, hydrometers, thermometers, siphons, hoses; anything that can be sprayed, I use StarSan. For sanitizing carboys or sediment collecting jars; anything that can be sealed up, I use k-meta.
I always use k-meta for sanitizing my bottles when I start to fill them.