Doesn't really matter which kinds of scanlines you use, the purpose is to soften the harshness of low res blown up to 32" super sharp super square displays of today. The result is a more forgiving experience, more like the game designers would have intended it on all kinds of home computers and consoles of the day.
Right now my fave displaymode is 640x400 in WinUAE "hires single" (640x256) analog-resized to get square pixels in games on my CRT. Even though the CRT is a PC CRT and thus has less pillow-shaped pixels, at least I get rid of the doubling effect in f.ex. 512x384 or 640x480 or higher resolutions.
It actually rocks
If you don't have or want a real machine, get a CRT + emu.