Nobody can say for sure which team is the greatest. That's why it's such a fun debate.
I'd like to see some more love for Frank Selee's Boston Beaneaters of the 1890s. They were a better team than the Orioles of the same era, IMO, and yet the Baltimores get all the love.
I can't say as where the Boston club is the greatest of all time, but I'd certainly rank them above the Old Orioles -- even if McGraw, Keeler, etc. were more colorful.
And although there's simply no way to quantify it, those Pittsburgh Crawfords clubs of the 1930s had some pretty impressive ballplayers on the roster, most of whom were in their prime. I'd throw them on my "all-time" list, just because of the eye-popping talent assembled, even though we'll never really know how good they could have been. But, man, you talk about ballplayers! They rival the Big Red Machine for sheer star power: Paige, Gibson, Cool Papa Bell, Oscar Charleston, Judy Johnson, Double-Duty Ratcliffe. That's a hellova team right there!!!
"Hey Mr. McGraw! Can I pitch to-day?"