it all depends on the type of coins we are going to invest, not all altcoins can provide promising benefits, only a few potential altcoins can provide many benefits because some potential altcoins already have a lot of investor interest. another case with bitcoin, I still believe that bitcoin is very appropriate to be used as a profitable long-term investment compared to some other altcoins.
I would even say almost all altcoins are not likely to give profits, what more to mind about benefits!
Even the alts I like a lot, let us say Monero, Litecoin, for example, these give benefits of either private transactions or fast/cheap ones and are getting bigger in adoption day by day yet their price does not reflect this.
Bitcoin is still the choice, no question.