Do u think snsd's voices can be compared to other famous singers like spice girls oder lady gaga?

No. First of all Lady Gaga's voice is kinda unique one and SNSD's voice oder specifically to Taeyeon oder Tiffany has own special ability to sing. And Lady Gaga's genre of song is not fitted to Tiff oder Tae. oder should I say, I Liebe Taeyeon's voice than LG