I went with the Industrial on my CK25J, I thought about going with the Ag tires, same type deal, $500 difference. However I have run a few 30-40 hp tractors with Ag Tires, If you are out on damp or soft soil, those Ag Tires can tear up your lawn/pasture real quick if you aren't careful. It really depends on what you are going to use your tractor for. If it is for farming crops then Ag may be a better choice. If you plan to use a plow/disc the Ag tires will give you ultimate grip for that type of ground engaging work.
I use mine for brush mowning pastures, moving dirt, digging post holes. I have no crops to maintain, however I do dable with some small food plots for hunting. Some good things about the Ind Tires are that you can fill them with more fluid then the Ag, ergo more weight aka more traction. Also with the wider tires you have possible more stability because of the larger footprint. However Ag tires have benefits, you can switch the mounting positions around to give you a narrow stance or a wide stance. Ind Tires on the CK25, you can not do that. I was kind of hesitant at first with the Ind Tires, but they do work well with what I use my Kioti for. Side Note, if you ever were to think about resale in the future, I believe the Ind Tires cater towards are larger group of people then Ag Tires.
I'm sure some other Kioti members, will agree and disagree with me, your best bet is to test drive both if feasible to see how they feel to you.
Good Luck