Ravencoin has always been a bit of a darling to me. I like that it seemingly had Overstocks support at one point and had paid developers working on it. Ive never even heard of Ergo, so I assume its just another shitcoin with a large advertising budget? If it were me and I had to choose between holding those 2 coins, I would mine a more profitable coin and use them to purchase RVN. Better would be to use a site like NiceHash and stack sats