Personal preference. The 190 has a bit more meat on the side of the tire, if you are doing any track days or really hard riding... but the 180 is lighter and makes the bike a little nimbler. And that's about the shape of it......... oh and you pay a bit more for the 190.
I put a 180/55 back on my Tuono this year. It works better than it did with a 190 (but the brands are NOT the same, so it's not cut and dried).
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