For me, it depends on how long I'll be there, and what the weather is supposed to be. If it's super hot or super cold, I probably won't use my balcony anyway, and if I'm only there for a night or two, I don't really need a view.
I will say that my last stay was in a standard view, and it was a roof view - but since it was a standing only balcony and I was only there for two nights (and arriving late on arrival day and departing early on departure day) it wasn't a big deal. But if I was there for a few days in more temperate weather, I'd spring for the garden view.