I'd rather a Synblend like Valvoline Maxlife 10w-40 with a KV100 >15 and an HTHS of 4 when temperature permits vs Mobil 1 0w-40 at KV100 12.9 & 3.5 HTHS but that's just me. Thicker base oil viscosity is better for your timing chain and cams anyways.In general, if the W # meets your cold temp requirements:
Narrow spread = Less plastic
Which is good.
However, 0W oils have a better base oil ... and you have to be careful what you are buying when buying 10W. For example I like M1 EP 10W-30 but prefer a 0W over inferior 10W-30s like dino or syn-blend.
With 10W, they can dump a dino or blend on you but with 0W you get a better oil without much needed research. Meaning when you buy a 0W, they can't dump a cheap dino or blend on you.