sunfish
Fish Head
Sq ground cuts a little faster than round ground, but is a pain to sharpen. & few folks have a grinder to do it. You can try one and just sharpen with a round file when it gets dull...OK, that settles that. My 562 will stay 3/8. Too bad; I've got a dozen or so 20" .325 LPX chains.
What about square chisel - e.g., 72CLX or 72CKX (skip), vs. round-ground chisel? Pros & Cons? I've never used square-ground chisel chain. Plus I always sharpen my own chains by hand, and I recall having read somewhere that it is more difficult to hand-sharpen square-ground chisel chain.