There are currently 3 DAG cryptos on the market, IOTA, GBYTE and XRB (RaiBlocks).
IOTA still has closed source components that needs to keep the chain alive and it already pumped to oblivion even though it's not decentralized atm.
GBYTE seems good, but as far as I saw it has transaction fees.
RaiBlocks is still a very low market cap coin, but managed to achieve a fully open source decentralized network with 0 fees.
https://github.com/clemahieu/raiblocks/wikiIf you want to gamble a bit, it's pretty clear which one will be a better mid/long term investment.