Just-dice I think it still offers investment but the players who bet there have dropped very significantly, even so for me just-dice is still a profitable site for investment. your point is investment so I highly recommend choosing just-dice.
The number of players drops significantly after dooglus decide that just-dice wouldn't accept BTC anymore. JD only accept Clamcoin both for betting and bankroll investment. The problem is, like any other altcoin, its price is even more volatile than Bitcoin and the coins never really get anywhere besides getting accepted by JD.
Clamcoin had its good days , then it became just one of the thousand faceless airdropped tokens with nothing behind it , sadly
Dooglus did a very good job with his site , some call it one of the founding fathers of dicing , along with Primedice
but a site that only deals in one cryptocurrency , even if it is bitcoin
cannot succeed nowadays , there is simply too much of a competition around and the new challengers appear every day literally
once again , fancy an investment - go for the tried and trusted :
bitvest.iocrypto-games.netyolodice.net