Tires are one of those things that are very rider dependent. For example, I loved having Kenda Small Block Eights on the front and rear, but other absolutely hate the SB8. You either have to lean more towards low rolling resistance or better grip. A good in between is to put a low rolling resistance tire (like the SM8) in the rear and a good grip tire (like the Kenda Nevegal) in the front. It's up to personal preference in the end.