Well then, start buying tires. I like a low tread narrow and light tire (2.1 - 2.2") on back that spins up fast. It makes the bike feel fast. The front is much more important when it comes to grip. For that, I use a 2.4 or 2.5 with fairly aggressive shoulder knobs. The lack of tread on the rear tire doesn't affect climbing as much as rider skill and tire pressure.
A couple of all purpose tires that have worked well for me in the past are Continental Vertical Pro's 2.3 and WTB MutanoRaptor 2.4. Both tires are about 2.2" wide and work very well for front or rear and have low rolling resistance, but the Muntano is faster. Like any tire,you need to get the air pressure adjusted to your weight in order for it to perform well.
There's lots of other good choices out there too - you just have to try them all. LOL
Also note too, that terrain and even the actual weight of the rider can affect tire performance. A heavy rider can make the tread squirm and the tire will feel slow. The same tire under a light rider, could feel very fast.
As you can see, it's not easy to pick the right tire. You need to try many. For the most part, tire reviews mean nothing unless the rider states the type of terrain he rides,his weight and the different air pressures he's tried. The "wrong" air pressure can turn an excellent tire into A POS.
Also, you can save a lot of money by not buying pairs of tires.