If you haven't found any coin you are specially fond of, ethereum is a good choice.
It is poised to grow although some coins might grow faster.
In price growth you can expect it from any other altcoins to make faster than ethereum, perhaps if your looking in much safer or less risk you can hold ethereum as long as you wanted. That was a battle of trusted altcoins vs new with higher risk and nice projects that have not been prove at this time.
