Sorry  I still don't  understand  the real potenciality of  some projects  for  example   Ardor  and  NXT  and  IGNIS, and  NEM

I  saw  them  here   a  couple of times  and  everyone  said ''Invest on them, thy are   good  projects''

Can  you  please explain me  what   do they make?  

As  I have understood  they are project  comparable to ETH

What  makes  them appealing to  me  is  that they  have their  own  blockchain completly  separated  from the bitcoin blockchain?  

So  should  they be valuable?

Please help   I can't understand the real potenciality  of  these projects  

Please help