Its up to you which coin you choose but one thing you have to see before selecting every coin is that whether that particular coin is worthy to be mined or buying it from exchanges is more profitable. After then you can make your investment plan. CHIA is using PoST algorithm, its price is high so will be its mining complexity.
There are many coins out there in the market and you can select yourself which coin to buy or mine. Mass was a big hit in the start since it gave the concept that crypto can be mined on your spare space of HDD. there are many who bought it in early days got huge profit, there are many such gems hiding.
MASS was a big hit I remember in its early days of its enlistment to exchange. It was up for sometimes but for few months its down despite the fact that crypto market is fully bullish. This is not good for the future, if a coin cant move on its own even when BTC is up then how it can survive in coming days when market is bearish.