This poll is not exactly for WinUAE scanlines imho, check the forum/threat title.
Anyway, i prefer the scanlines in WinUAE because the ugly pixelated double pixel setup isn't the look we know from a real monitor/TV. Especially letters are awful without scanlines in WinUAE/lowres. I still think that it looks really good with a 25% scanlines filter.
http://eab.abime.net/showpost.php?p=...&postcount=185