The best replacement for preacher curl is standing curl.

The best alternatives to preacher curl are rated as following:
★★★★★  standing curl
★★★★★  concentration curl
★★★★  barbell curl
★★★  hammer curl
★★★  spider curl
★★★  dumbbell curl
★★★  scott curl
★★★  bicep curl
★  arm blaster
★  incline curl
★  barbell
★  standing barbell curl

Your alternative for preacher curl is not listed? Suggest!
Speaking about preacher curl, one probably shouldn't forget about incline bench.

Other search terms related to preacher curl and their ratings are:
★★★★★ incline bench
You have in mind a companion for preacher curl and it is not yet here? Propose!



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preacher curl
standing curl
concentration curl