I find that most people gravitate towards shaded areas, unless they're sunbathing, or not really walking. It's the difference between being mildly uncomfortable and being drenched in sweat.
I get a little leery of grand plans for broad, sunny boulevards and plazas for that reason. There seems to be an obsession in this town against the idea of buildings casting a shadow; watching the BRA force architects to do shadow studies is quite funny. Or seeing residents stand up and insist on large setbacks because "it encourages walking" (somehow).
But I agree there is no right answer for arcades vs awnings, and variety is the best anyway.
You may be right, and the good things is that because we have been building cities for 6,000 years, someone somewhere has probably intentionally observed the walking habits of people. I don't personally tend toward shady areas, I avoid them--even on sunny days--but maybe others act differently. True, if I worked in construction, I would choose a shady area on my lunch break, but working inside an office all day makes me seek out the sun.
I share your discontent over the aggravation about shadows in Boston and everywhere, but what I've come to learn is that (1) this is just a product of development, and won't change absent some sort of upfront design based ordinance (form based code, or something that uses the same charrette process), and (2) it may be a good thing if people complain about shadows or any aspect of new development, because it means the place is worth caring about. They may not share your or my vision for the future of development projects, but they care about what's already there, and that matters most, even if it's less exciting because we know it. In places where NIMBYs don't exist, no one wants to be there. Would City Center in Las Vegas get built in Boston? Probably not. But would you want to reside in Las Vegas? And of the (many) people who do reside there, how many do so by choice versus by necessity (economic)? That's the real issue to examine.
I'm writing from Portland, which is just as bad if not worse than Boston when it comes to shadows and NIMBYs in general (and I'm on the planning board, so I know), but at the end of the day, everyone is entitled to their opinion, and efforts should be focused on deciding what that opinion is BEFORE a project is proposed, so that consensus as to what is acceptable can be achieved, and meaningful projects proposed/built, instead of hassling everyone with back end review that results in a project less than satisfactory to all involved.
What does this have to do with awnings? Nothing really, I should have stopped I read that variety is best anyway, because you summed it up well with that point and not much further needed to be said. That's what cities are all about, and that's what makes them interesting. Now, had the question been which is better, awnings or video game arcades, I think there would be a definite answer.