The best cryptocurrency to invest is bitcoin because it seems it can be even only winner in the very long term.
no doubt bitcoin is built to last a lifetime but it isnt alone there were also solid coins out there that can be good as addition or for diversification to our capital . few examples could be , eth , xrp , bch ...
Other ones are very risky, privacy ones can be threaten by governments.
privacy coins like monero is not a threat to governments . infact cryptos like bitcoin is also considered as a privacy coin due to thier anonymous feature . it only depends on the country because some country thier governance ban cryptos but majority are already supporting it .