The best replacement for drop shot is carolina rig.

The best alternatives to drop shot are rated as following:
★★★★★  carolina rig
★★★★  texas rig
★★★  split shot
★★★  jig
★★★  jump shot
★★★  shakey head
★★  dropper loop
★  varlion

Your alternative for drop shot is not listed? Suggest!
Speaking about drop shot, one probably shouldn't forget about swivel.

Other search terms related to drop shot and their ratings are:
★★★★★ swivel
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drop shot
carolina rig
texas rig