The question of which is the best VHDL, Verilog or SystemVerilog editor, will obviously depend who is asking. Different digital designers have different requirements for their HDL editors.
The following features can influence engineers in their choice for an HDL editor:

Basic features

  • Syntax highlighting
  • Templates
  • Code folding
  • Block selection / column mode
  • Auto indent
  • Configurable key bindings

Semantic features

  • Error marking
  • Code navigation
  • Semantic highlighting

Integration with:

  • Simulators
  • Synthesis tools
  • Version control systems
  • Error trackers / ticketing systems
  • Code review tools