finnish: ui sounds better than wi in all tested cases (subjective opinion). I haven't heard of any rule saying ui should be pronounced like wi.

dictsource/fi_rules

@@ -200,9 +200,9 @@
 .group u
           u          u
           uu         u:
-          ui         wi
-       _) ui         ui   
-      _j) ui         ui   // [ui] sounds better than [wi] when stressed. Especially <jui> at the beginning of the word sounds bad if pronounced [jwi]
+          ui         ui
+//       _) ui         ui   
+//      _j) ui         ui   // [ui] sounds better than [wi] when stressed. Especially <jui> at the beginning of the word sounds bad if pronounced [jwi]
           uii        u|i:
           uo         uo
           uoo        u|o: