should it be invested in bitcoin and hold?
should it be invested in alt coins?
and why or what will make it sustainable via etc vs. alt investment
I think it will be better if you will invest it to Alternative coins whom do you think has a potential similar to bitcoin and Ethereum. With a great luck that 100k of yours can make you a millionaire just choose a good coin like Ripple, NEM or IOTA or
should it be invested in alt coins?
and why or what will make it sustainable via etc vs. alt investment
Actually to be able to get a lot of advantage I think bitcoin is a selection of the most important thing to do, because it's been proven with certainty the bitcoin and many penggua who already has many advantages. But if indeed you want to invest in addition bitcoin, then it would be much better to invest in ICO. Because there we have a greater opportunity to profit, but it must be done the right way