it depends on your image .namely iso images can be converted to cd itself by a cd writing software ,whereas for .mdf ,.mds,.cdda etc alcohol 129% is good.
For iso image use Winrar
For .vc7 image use Virtual cd
For mfd image use alcohol
For nrg image use Nero
for ccd image use clone cd
for bw2 image use blindwrite
for pht image use phantom