The best replacement for galaxy core is s3 mini.

The best alternatives to galaxy core are rated as following:
★★★★★  s3 mini
★★★★★  xperia m
★★★★  galaxy win
★★★  galaxy grand
★★★  s duos 2
★★★  galaxy ace 3
★★★  xperia l
★★  s duos
★  grand quattro
★  xperia m dual
★  galaxy s duos
★  galaxy grand quattro
★  lumia 525
★  samsung galaxy trend
★  samsung galaxy grand
★  galaxy s duos 2
  canvas hd
  galaxy infinite
  ace 3
  galaxy s3 mini

Your alternative for galaxy core is not listed? Suggest!
Speaking about galaxy core, one probably shouldn't forget about grand quattro.

Other search terms related to galaxy core and their ratings are:
★★★★★ grand quattro
★★ xperia m
You have in mind a companion for galaxy core and it is not yet here? Propose!



Google Trends

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galaxy core
s3 mini
xperia m