bitcoin has an incredible amount of computing power behind it working to secure the network for one, but also we need to understand that the amount of financial incentives behind bitcoin are nearly 2T dollars worth, so there are far more people putting security research and security development into making sure that bitcoin is secure and stays secure. people have been doing this for 16 years. dogecoin is a joke. financially, it has far less scrutiny over it's codebase, imo.

as a side note:

dogecoin almost failed in 2016 because so few miners were mining it. they switched to merge mining with litecoin to stay relevant. so when you mine litecoin, you now get litecoin and dogecoin as the reward. this is how dogecoin survives today.