saving bitcoin in past has given me enormous profits and I am always stocking some coins because no one knows when the price might hike and give us big profit. Altcoins are good too 
Altcoins are really good at a moment so its good to put some money in altcoins and meanwhile let the price of bitcoins go higher so best thing would be investing money in bitcoins and holding them and trade altcoins to make quick profits and also to grow the level of bitcoins in our wallet.When trading with alternative coins, one must always remember that this is very risky. No one can guess what will happen to them tomorrow.
I try to save almost all my savings in bitcoins
If you want to get rid of risk of investing then the safest way would be to hold them and keep them safe in bitcoin but the only issue in holding is that it will never grow your coins in long run which can be done with trading but its recommended to invest in trading only if you have good knowledge of it.
Even in the retention of coins there are risks. But I agree with you, they are minimal. Now I'm investing only in bitcoin, for the reason that I did not find projects worthy of my attention. I trust Bitcoin.
Yes the best place to invest your money is into the bitcoins itself as it will prove to be an best investment in future so don't invest your bitcoin in any ponzi or cloud mining site and the right choice would be to hold your bitcoins for a long term.