Stablecoins won't have a potential for the significant increase of the prices, meanwhile meme coins are too risky because they have no fundamentals and the prices only rely on the hype. These 2 types of crypto coins aren't safe for investment, specifically for the long term investment.
I think stablecoins can still be used for long-term investment. This is because price stability tends to increase, although only slightly from year to year. but perhaps only for holding long-term assets. not to make big profits.