Mr KTM's got a point. However, I'd like to point out that it's not tyre-life, tyre-pattern, tyre-colour (thanks for using my pic, btw ), or brand. It's the feeling that's important. If the tyre inspires confidence in the rider, then that's a good tyre for that rider.
On the aforementioned, my chicadee hated her BT-14s on the GSX-R600. She found the tyres just fine. I found them (felt hard and very uninspiring). We both loved the , both on the GSX-R600 (6,000 miles and counting!) and the K1200R. However, I found them starting to slide after 3 back-to-back laps on the 'Ring. Overheating, a bit, methinks. I used the Pirelli Corsa III on the K1200R last, and I found them pretty much the same as the Sportec M3 (they are sister tyres after all). However, the SDR came with Corsa IIIs and I find them hard as a rock (but I haven't double checked the tyre pressures).
Heard a lot of good about the BT-16s, but not tried them myself.
Back to Mr KTM's comments, he's right about the chicken strips etc, but add to it that a stickier tyre will only make you a few seconds faster on a short-circuit lap, but will probably halve the tyre life. IMO, not worh it. There's also the heat cycles, if you're into that sorta stuff. Sticky road tyres, IMO, are good enough for most, even in the wet.
Pota-toe, po-taytoh...