The best replacement for u3 is u6.

The best alternatives to u3 are rated as following:
★★★★★  u6
★★★  u1
★★  portableapps
★★  portable apps
★★  ceedo
★★  u6 unemployment
★  u1 yamaha
★  u5
★  kawai k3
★  yus3
★  kawai k5
★  baby grand
★  kawai k6
★  t6
★  yus5
  ux3
  secureaccess
  sf-19
  portableapps com
  u2
  u1 piano
  audiophilleo
  iaudio g3

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Google Trends

Scale is based on the average worldwide traffic of u3 in all years. Click on graph for more.
u3
u6
u1