Oh fuck, I guess I'll cling to that upside in my grief later on.

I'll toss it on the ol' docket.

I've only read two Poirot novels -- Murder on the Orient Express (duh, who hasn't?) and The ABC Murders -- and they were fine. With Holmes I've mostly read the short stories, so I'm biased towards Holmes in large part because I prefer the format of short mysteries, but of course both Holmes and Poirot exist in both formats.

I don't think either is all that deep to be fair.