Unfortunately no experience with either of the two tires you mention. If you're open to other ideas and your budget is flexible (remember tires are the most important upgrade/part of the car as they translate everything you do to grip on the road/track) I'd suggest buying the best tire you can afford. I'd suggest considering Michelin Pilot Super Sport tires in your search. They come in 275/35ZR18 (99Y) XL which should fit your wheels. Not cheap by any stretch but I love them on my daily driver. Great in the dry, good in the wet and lousy in the snow.
RR '92 Calypso Green LX Coupe: Griggs GR40, 331