To compare these two projects and thinking no influence from a known personality, I simply think that SHIB will be able to survive over Doge. Might saying it was a tough competitor among meme coins but to know who gonna last longer is something unpredicted.
It is likely that most of the meme coins won't survive but with these two, doge and shib. They're likely the two that will only survive long term.
Dogecoin has survived for so long and then shib being listed on Coinbase, that makes it a factor that it can survive for long until it's being delisted.