The best replacement for trellis is pergola.

The best alternatives to trellis are rated as following:
★★★★★  pergola
★★★★★  lattice
★★★  arbor
★  osticket
★  angiojet
★  arbors
★  hesk
  steel trellis
  an arbor
  cages
  dendritic

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

Other search terms related to trellis and their ratings are:
★★★★★ planter
★★★★★ gate
★★★★★ planter box
★★★★ vines
lattice
pots
You have in mind a companion for trellis and it is not yet here? Propose!



Google Trends

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trellis
pergola
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