The best replacement for balusters is spindles.

The best alternatives to balusters are rated as following:
★★★★★  spindles
★★★  wood balusters
★★★  hollow iron balusters

Your alternative for balusters is not listed? Suggest!
Speaking about balusters, one probably shouldn't forget about wood railings.

Other search terms related to balusters and their ratings are:
★★★★★ wood railings
★ wood handrails
You have in mind a companion for balusters and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of balusters in all years. Click on graph for more.
balusters
spindles
wood balusters