Definitely it is Ripple, its transaction speed is about 3.5 sec, then goes ETH with 15 sec.

I'd recommend you to invest only in "reliable" Ponzi Schemes with a real history, such as Bitconnect.

I think that one of the most promising and trusted coin to invest is ETH, but as its price is rather high, you can choose something like NEM, Ripple or Waves.

That's a good choice! But I would replace NEM to NEO)