Ah, so maybe the question needs to be determined by my hat/scarf situation. I just did a quick evaluation -- sorry no pic yet; my phone is MIA -- and it seems like the real workhorses in my winter accessory collection are solid colors:
A red watch cap
Beanies in sage green and light grey
A merino scarf in olive green
A matching olive green watch cap
A charcoal cashmere scarf
Cranberry mittens
Light grey mittens
I have one set of multicolored hat and gloves in rich fall colors that won't really work with either of these jackets -- but that's okay because they look great with solid black jackets or with my olive green coat.
I have one plaid scarf, in black watch, but it's kind of scratchy so I only wear it when it's really really cold, which generally means I have a down puffy on.
One of my goals for this winter is to build a little more variety into this capsule anyway (and try to tilt the color balance away from Autumn colors and towards some cooler, more saturated Winter colors), so the jacket purchase may just inform my future accessory shopping.
The plaid will be more fun for me to wear, so that's where I'm leaning.
AviaMariah -- I think the white flecks are just snow, or pseudo-snow, in the photo. I got to try this on in real life, and the blue was definitely solid and fairly saturated, not heathery at all.
Speaking of white flecks -- I suspect the plaid will do a somewhat better job of hiding my dog's black and white hairs, which is always a consideration.