I think it's too early to predict which meme coin is better than the other, between Dogecoin and Shiba Inu at the moment. The meme coins are highly speculative assets thus people buy them regardless of their features. They grow based on pure market speculations and momentum. If we look at this year 2021 between the two meme coins, then Shiba Inu is no doubt the better investment but we don't know what is going to happen tomorrow.
If you choose between Doge or Shiba then it's the best choice compared to investing in other meme coins, new meme coin projects traded on pancake swaps are very risky because the price and volume will fall drastically when the team has played a role in selling the coins they hold at other addresses.