Hi Rolf,
Probably worth getting familiar with looking at chops, even if you can't actually read them! There are so many that you won't be able to know them all, but if you know particular potters/kilns that you like then at least being able to identify those chops can help you. That way if you are buying pots at a nursery you can ask if they have specific pots you like.
For instance my favorite pots generally tend to be made by a potter under the name Koyo, now taken over by his son and renamed Juko. Their work tends to be quite recognisable, even without having to check for a chop mark, due to the style of their glazes. When i am in Omiya next year i will be looking specifically for Koyo pots along with some other potters and kilns that i gravitate towards.
This link is a very useful resource for checking chop marks against,
https://japanesebonsaipots.net/chop-and ... -resource/ but there are so many that trying to do it while inspecting pots will be a nightmare. Very useful after the fact once you're home and have some time to sift through it though. You could take a screenshot of the chops of the potters or kilns that you like and keep them to reference back to while you are over there
Tokoname is not a by-word for quality; the region is better known for making teapots and toilets than bonsai pots. Remember that no single potter or Kiln produces only high quality work. Just like any business, they will produce a range of quality and at a range of prices. There are cheaper mass produced pots out of Tokoname, as well as high quality work too.
Some of the best, and oldest pots don't even have any maker's marks on them, so don't feel that just because it has a chop on it it is somehow better; though those pots are likely outside most people's budgets! In the end, over and above all other considerations, my recommendation would be to buy pots that you like and will actually use. Pot collections are great and all, but they still take up space even without trees in them!