New Dice sites might be more advanced and offer interesting options (instant deposits based on confidence level, investing option, jackpots)
but PrimeDice is probably the most trusted Bitcoin gambling platform, and trust is the best asset you can have in this business.
Happy Birthday, PrimeDice.
Since now transaction fees went so high for bitcoins so some of the smaller players don't want to waste their money in fee so they may want to play with other altcoins which can reduce their transaction fee and save more coins for those players. I think primedice need to seriously consider adding at least another one alt-coin which is having a lesser fee and faster transactions.