I prefer always leaning when I can. Say later on down the road, figuratively speaking, that you come into a corner faster than you meant to, or you have to lean fairly far in order to get out of harm's way. There are a few benefits to always leaning into turns. One, you are familiar with the lean feeling so when the time arises, you don't freak out and start reaching for controls randomly. Also, when you lean on every normal ride, you don't get the squared edges on the tire. That makes it so that, when you have to lean far for whatever reason, the tire doesn't skip from the middle of the tire to the edge, causing you to low side. I'd always lean at the same angle as the bike as well, always maintaining equal pressure on the tires as best as you can so you can get the best grip in each corner. If you lean in sharp corners or lean with the bike, then the only things that should cause squaring on your tire are improper tire pressure (my stepdad doesn't check his busa tire pressure. When I pointed out it was low, he filled it and he has a good three inches of chicken strip in the middle of his tire) and your everyday riding style in terms of your speed into corners and your normal/maximum lean angle. If your maximum lean angle is fairly far, you shouldn't ever have a problem with the tires skipping during a lean
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