The best replacement for smap is arashi.

The best alternatives to smap are rated as following:
★★★★★  arashi
★★★  kat-tun
★★  kat tun
★  古畑任三郎
★  smap
  嵐

Your alternative for smap is not listed? Suggest!
Speaking about smap, one probably shouldn't forget about akb48.

Other search terms related to smap and their ratings are:
★★★★★ akb48
★★★ arashi
★★ f4
You have in mind a companion for smap and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of smap in all years. Click on graph for more.
smap
arashi
kat-tun