There actually might be a difference in favor of LP. LastPass knows, semantically, what encrypted password archives are, and can monitor for statistically unusual traffic related to an attacker downloading them.
Google has no no way to know, if 10k people are storing their encrypted keepassx archives in gdrive, and if those 10k archives are accessed in rapid succession, that it's an attack. It's lost in the noise of gdrive traffic.
That blade cuts both ways: the keepassx archives would be lost in the noise of all the other files on Google Drive/Dropbox/etc. On Lastpass, you know you're getting password archives. To me: advantage KeePass.
Google has no no way to know, if 10k people are storing their encrypted keepassx archives in gdrive, and if those 10k archives are accessed in rapid succession, that it's an attack. It's lost in the noise of gdrive traffic.