It depends on what type of racing you're doing.
A SC'd car will be more consistant and easier to drive for a novice.
A turbo car will make SOOOOOO much more power and TQ at the same boost level than a SC that it isnt even fair to compare them.
[B]1951 McCormick FARMALL M
2007 MINI Cooper S Turbo... new project car
1998 Chevy 3500 Ext cab, long bed, 4x4, duelly, turbo diesel
2004 Harley V-Rod.... sex on wheels
2011 Harley Electra Glide Ultra Limited