Stihl chain will typically have harder cutters, not quite as sharp right off the roll and often need "touched-up" before using it. At least if you are picky about those sort of things. I use and prefer semi-chisel to full chisel with .325 up to 18". Beyond 18" bars it's best to move up to 3/8"...IMHO.
Semi-chisel doesn't "grab" or cut quite as fast, but it sure stays sharp a lot longer, especially if you are in any dirt at all.
I used to run full chisel only on everything, but in recent years have moved many of my chains over to semi-chisel. On larger saws one quickly becomes disillusioned that the semi-chisel isn't cutting fast enough, but it really isn't that far off of full chisel and for sure you can cut a lot more wood without taking a file to it.
I'd also add here that when purchasing 3/8" chains avoid the type with the rakers that look like a folded over dorsal fin.....complete JUNK........Cliff