Should I use an OBS teleprompter or a DAW lyrics plugin?
OBS prompters scroll at a fixed rate for a talking-head script, which is the right tool for video and the wrong one for music. A DAW plugin reads the transport, so the pacing follows tempo changes instead of drifting away from them over three minutes.
A words-per-minute prompter assumes the reader sets the pace. In a song the track sets the pace, and any constant-speed scroll slowly falls behind or runs ahead until it is useless.
Reading the position from the timeline sidesteps the whole problem. A half-time chorus, a tempo map or a rallentando is followed without anyone touching a speed control.
Plenty of people do both. Run OBS for the stream layout and the plugin for the lyrics the performer reads — they serve different screens and do not conflict.
No card required. Install the VST3, paste a lyric sheet, and record one take end to end before you decide.
Yes, it is a normal window, so window capture works if you want the lyrics visible on stream.
For scripted reads an OBS-style prompter is fine. Once there is music on a timeline, the DAW-synced approach is more accurate.