I am planning to purchase a Metabo KGS 254 miter saw soon, but I am considering which saw blade is suitable for mitering baseboards in outer corners. It comes with a 48T blade, but I'm unsure if this might be too coarse. I also see there is a 60T blade available, but it is quite expensive (around 1000, so if I can manage with the one that comes with it, that would be great, of course.
I would say you manage quite okay with the one that comes with it, but of course, it depends on the demands you place. If you're mainly doing carpentry with the saw, I would undoubtedly switch to a quality blade with more teeth.
Another trick is to make a sacrificial board (Glue 12mm MDF as an "L") that you mount into the aluminum guard on the saw, and secure it from the backside. Then, set the cutting depth on the saw so you don't cut through the sacrificial board. This way, you avoid almost all chipping on the moldings when you cut. See the picture below. This is good to do even if you buy a fine-toothed blade.