Ok well I have been growing quite a few both ways.
But when growing lots I find out how much harder inground is to dig…, I have dug and transplanted from my grow garden so far this fall over 20 peaches 3 to 6 ft, 3 almond 6ft, 10 4 to 5 ft persimmon and 40 2ft persimmon±… and other stuff…
And I am picky about trying to get all of their roots so with bigger trees or even small persimmon that shoot 1.5ft deep pretty fast it is a lot of digging…
And to stoop down and graft is harder inground too(I recall Mr Cliff England mentioning that once)…
And potted has better roots that i disturb less when transplanting.
So I ordered a bunch of 4"×13.5" tree pots…
For growing lots of trees, or for a nursery, especially for deep root type trees like persimmon and pawpaw they are the only way to go imo. For shallow root trees like peach I might do more inground, but I grew persimmon in 3 gal pots this year and they did great plus the gophers dont bother them like inground they took out several.
If soil is light and you spread out plastic sheeting under trees so roots don’t go deep the trees will be much easier to dig up, even 2.5" heavily branched, bearing age trees and they tend to grow much faster than in pots, especially J. plums and peaches. If you want ease in taking out of the ground I recommend inground “potting” systems- I use knitted Whitcomb rootmaker bags. For peaches I use 21" bags and only fill them about 60% from the top (planting the bags shallow). That way they grow wide shallow rootsystems and are easier to move around when transplanting. In heavier soil this is probably the best way to go. Works well in the Northeast anyway.
Ok thanks for sharing yeah that is a good idea to help for sure! 
I plan to move out of my parents basement next year or the year after so I have been growing in pots. I have pretty much switched to grow bags all together because of their lightness when transporting. If you are not growing them to be transported and have the choice of in ground vs out of ground I would go in ground. It will be a lot of work digging them but a pot will stunt the trees and you will not get as much production out of them. You may also want to go one zone colder than expected because pots do not have the insulation of the ground. Some things I have no problem with in zone 5 but other things I can have issues with. Apples are ok in zone 5 because most apples seem to survive any coldness in zone 5 because many are hardy to zone 3 and 4 while the cherries or peaches may need more protection. I try to cover them if it gets too cold. Just mentioning that because it is a extra layer of work you have to do during winter when it is more than likely super chilly outside.
Thanks yeah thats good points to consider. Here in zone 6b that is an issue for things like persimmon for sure. I plan to overwinter potentially vulnerable dormant potted zone 6 stuff in the unheated barn.
I did that only in the garage. It certainly creates a microclimate. I was able to fully overwinter Morus nigra mulberries which are only supposed to be hardy to zone 6 or 8 that way.