Summer tyres question

moin, we still have the winter tires on it and ponder just over summer tires. we have currently nokian mature in 205/50 r16 zr on the rims. of which unfortunately a totally wrong expired last summer, track we had to adjust afterwards, but was only minimally misplaced, hope it is now ok. since you can not only replace a ripe one, we now ask ourselves the question, we buy 4 new ones in 205/55 (may like the ones driving at all on our t5, I mean to have read this) or we buy only two new ones in 205/50 what do you think of the test results of the adac? are really meaningful? are so cheap Asian matures generally worse or are there also those which are good though they are favorable? the adac have also tested the fuel consumption, I find that already interesting that there are such differences and would like to buy mature ones, which consume little sprit. on the other hand we just don’t have the money to buy now for 400€ new ones to buy the Kko4.