I have a Stella cherry tree which doesn't produce very many cherries and I grafted a cutting off it to a rootstock last spring. I also grafted a Montmorency last spring. Both of them to a rootstock that will grow a larger tree than my Stella is. They say that a fruit tree will produce more fruit if it has a compatible similar tree. You might think about getting a tree with two different varieties. Both varieties would have to bloom at the same time.

The other problem is that the birds eat almost every cherry the tree produces. My reason for growing a larger tree.

I was up along Lake Erie last summer and cherries were being picked while I was there. I tasted a big black cherry off a tree. It was a Summit cherry which was delicious and I bought a few pounds. . But I can't find a tree or scion for sale.

If you intend to plant only a single tree, make sure it is a self fertile variety. Sour or tart cherries - like Montmorency - are all self fertile so any would be a reasonable substitute. There are also a handful of self fertile sweet cherries - Stella, Lapins, Starkrimson, Blackgold.

My advice is to contact your county extension office and ask for their suggestions, as local conditions will generally determine the best cultivars to plant and the extension service knows best what will perform best in your area:-) The Philadelphia extension service can be accessed here: https://extension.psu.edu/philadelphia-county

When I bought the Stella cherry tree I was actually thinking of buying a Bing. But research indicated not to buy a Bing east of the Mississippi as it's too wet so the cherries split. I bought the Stella as it's "self fertile". But my experience is that it's not self fertile enough. And I'm guessing that the others may show similar results.

Here's a link to Raintree Nursery who sells 8 different trees with multiple varieties on one tree. Problem is all but one are sold out. Another option is to buy a tree this year and then next year graft more varieties to it yourself. Scions are $3.50 to "5.00 each. Google" Whip & Tongue Graft " for a primer. I just use a safety knife and I made a finger guard from the bottom of a 1/2 gallon plastic milk jug. I use grafting tape from eBay which looks like scotch tape with no stickum. The wider the better. Here's a link to Fruitwood Nursery who has 2 web pages of cherry scion varieties. I ordered pear scions from them this year and have ordered in the past. Shipping was $15.20, the minimum.

Don't over do the grafting the first year as you won't have much suitable wood to graft to the first year, and you need to preserve at least 2 branches of your original variety. Hope I didn't overwhelm you.