The best replacement for 420ex is 380ex.

The best alternatives to 420ex are rated as following:
★★★★★  380ex
★★★★  430ex ii
★★★  580ex
★★★  420ez
★★★  320ex
★★★  430ex
★★  550ex
  canon 430ex

Your alternative for 420ex is not listed? Suggest!
Speaking about 420ex, one probably shouldn't forget about 580ex.

Other search terms related to 420ex and their ratings are:
★★★★★ 580ex
You have in mind a companion for 420ex and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of 420ex in all years. Click on graph for more.
420ex
380ex
430ex ii