Yes, YFDAI is still an ecosystem related to DeFi, YFI is also one of the DeFi ecosystems too, if you want to compare YFI and YFDAI, maybe YFDAI will be the next YFI, if you look at it in terms of current prices.
Comparison of why YFDAI could become YFI because of the current supply of coins available.
YFDAI only has a supply of 21,000 and YFI is only 30,000 which means less than YFI in terms of supply currently circulating in the market.
Strong suspicion, investors who used to trade YFI, will run to invest in YFDAI coin, most likely YFDAI has a high trading volume also in terms of price.
No wonder the DeFi project is currently a target for investors to take advantage of the project's coins, because the supply of coins they create is very limited compared to other coins circulating in the market today, That's the game of companies and investors who want to take advantage of today's crypto world, of what they are currently creating.
these two points actually interested me in to invest in Yfdai
1. Circulation is quite low just like YFI
2. It have direct corelation with bitcoin prices, & right now bitcoin prices is increasing like anything