None of both is good for long-term investment, if you really want to get profit in the long term, then try the big and strong project.
Currently, there is no any my favorite meme coin, but Shiba Inu was my favorite one and I get a lot of profit by investing in Shiba Inu.
Yes, not only these 2 coins are not good for long term investment but all coin memes are not good for long term investment. Memes are only suitable for short-term investments because their future is very uncertain, other than hype, memes are of no use, they can die if the shark finds another inflater.
Long term investments should generally be in top projects like bitcoin or ethereum, coins that have been proven to create real and useful value over time, their value being created on demand and the real benefits it brings.
Although Dogecoin is a very popular old project and the best meme coins, but Dogecoin is not recommended for long term investment.
Moreover, other meme coins that are not yet popular, the risk is much higher for long term investment. That's because as you said,
the function of meme coins is not clear, so it's hard to expect to make a profit from meme coins. The movement of meme coins is
also much more difficult to predict, because often meme coins are manipulated by whales to make pump and dump. It is proven that
the price of Dogecoin and Shiba Inu pump in 2021, that's because there is Elon Musk who helps promote it, therefore after Dogecoin
and Shiba went up high, the decline was very fast.
Even though meme coins have proven to be a high-risk investment option, I still really need meme coins. Especially Dogecoin, I have been
using it for a long time to move my funds from one exchange to another. So until now Dogecoin has become the most favorite meme coins for me,
but I don't use Dogecoin for investment. As you said if we want to invest, it's better to choose top coins rather than meme coins, because apart
from being more profitable, top coins has a good track record. So the opportunity to make a profit is much higher if we invest in top coins
such as BTC and ETH.