If you plan to hold stable coin in longer timeframe let's say a month or year. Just choose stable coin that has a proven liquidity and running for a long period of time. I'm not pointing out USDT(Tether) since there are too many shady things about it together with Bitfinex so stay away with it.

I really don't to give a specific coin on this kind of discussion because it might affect others investment strategy. But I'm really impressed on PAX and the way they handle there development. You don't need to be concerned wether they will freeze someday since it was completely regulated and the team behind it was trusted.

PS: This is not a financial advice and all I stated is just my opinion. I will not be eligible in case you suffer losses when you follow what I write above. Trade Safe