wider tire. things that change the size of the contact patch would be lower tire pressures, etc, whereas changing tire width, alignment, etc will change the shape of the contact patch. so a wide tire has a nice wide contact patch, perfect for turning. however, it doesnt increase the size of the contact patch along the circumference of the tire, so straightline grip isnt effected. as i said, the best bet is to get a stickier tire compound such as an R compound or drag radial.
also, the Dave Point, good read:
http://www.sportcompactcarweb.com/ed...hno/index.html