Yes it’s like that you need to water it, fertilize it, mulch it and then callery will outperform it every time. The key is using the right rootstock for the right job. I like 333 but I’m not naive to its limitations. 87 and 97 is like callery for my purpose but costs more. I grow all of the aforementioned rootstocks besides quince and I grow at least a couple more. They are all ideal when you need them. Harbin is ideal in the north and you might think but it’s not dwarfing, it gets decline etc. but it really is the best. Bet is very likely the best Asian pear rootstock there is. The rest comes down to height, speed of growth, and disease resistance and take my word for it they all have advantages and limitations. Oxf rootstocks will sucker and are thorny just like callery given the right environment. BET can be invasive just like callery so it’s not a perfect world I just use what I know works to get fruit. Let’s face it many of the pears of old took 15 years to produce fruit and a few still do. Perry pear trees are real giants in Europe in many cases Perry Pears Cider. Check out the nearly 400 year old Endicott pear https://landscapenotes.com/2012/06/25/the-endicott-pear-americas-oldest-cultivated-tree/
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