The best replacement for bmw x3 is audi q5.

The best alternatives to bmw x3 are rated as following:
★★★★★  audi q5
★★★★  acura rdx
★★★  mercedes glk
★★★  lexus rx 350
★★  x1
★★  acura mdx
★  range rover evoque
★  bmw x5
★  lexus rx
★  volvo xc60
★  subaru forester
★  audi q5 2014
★  lexus rx330
★  mercedes ml350
★  acura rdx 2014
  cadillac srx
  lexus rx350
  volvo xc90
  jeep grand cherokee
  mercedes glk350
  land rover lr2
  mercedes glk 350
  audi q3
  mercedes benz glk350
  infiniti fx35
  nissan murano
  bmw x1
  freelander 2
  mercedes ml
  porsche macan
  nissan xterra

Your alternative for bmw x3 is not listed? Suggest!
Speaking about bmw x3, one probably shouldn't forget about audi q3.

Other search terms related to bmw x3 and their ratings are:

★★★★★ audi q3
You have in mind a companion for bmw x3 and it is not yet here? Propose!

Google Trends

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bmw x3
audi q5
acura rdx